</H1><P align=center><b>Daniel A. Powers
Department of Sociology
University of Texas at Austin
Yu Xie
Department of Sociology
University of Michigan
Copyright 1999
Academic Press, Inc. </b></P><P align=left></P><H2><A>Contents</A> </H2><!--Table of Contents--><UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00200000000000000000" target="_blank" >Preface</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00300000000000000000" target="_blank" >Introduction</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00310000000000000000" target="_blank" >Why Categorical Data Analysis?</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00311000000000000000" target="_blank" >Defining Categorical Variables</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00312000000000000000" target="_blank" >Dependent and Independent Variables</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00313000000000000000" target="_blank" >Categorical Dependent Variables</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00314000000000000000" target="_blank" >Types of Measurement</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00320000000000000000" target="_blank" >Two Philosophies of Categorical Data</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00321000000000000000" target="_blank" >The Transformational Approach</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00322000000000000000" target="_blank" >The Latent Variable Approach</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00330000000000000000" target="_blank" >An Historical Note</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00340000000000000000" target="_blank" >Approach of This Book</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00341000000000000000" target="_blank" >Organization of the Book</A> </LI></UL></LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00400000000000000000" target="_blank" >Review of Linear Regression Models</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00410000000000000000" target="_blank" >Regression Models</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00411000000000000000" target="_blank" >Three Conceptualizations of Regression</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00412000000000000000" target="_blank" >Anatomy of Linear Regression</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00413000000000000000" target="_blank" >Basics of Statistical Inference</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00414000000000000000" target="_blank" >Tension between Accuracy and Parsimony</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00420000000000000000" target="_blank" >Linear Regression Models Revisited</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00421000000000000000" target="_blank" >Least Squares Estimation</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00422000000000000000" target="_blank" >Maximum Likelihood Estimation</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00423000000000000000" target="_blank" >Assumptions for Least Squares Regression</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00424000000000000000" target="_blank" >Comparisons of Conditional Means</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00425000000000000000" target="_blank" >Linear Models with Weaker Assumptions</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00430000000000000000" target="_blank" >Differences between Categorical and
Continuous Dependent Variables</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00431000000000000000" target="_blank" >A Working Typology</A> </LI></UL></LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00500000000000000000" target="_blank" >Logit and Probit Models for Binary Data</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00510000000000000000" target="_blank" >Introduction to Binary Data</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00520000000000000000" target="_blank" >The Transformational Approach</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00521000000000000000" target="_blank" >The Linear Probability Model</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00522000000000000000" target="_blank" >The Logit Model</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00523000000000000000" target="_blank" >The Probit Model</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00524000000000000000" target="_blank" >An Application Using Grouped Data</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00530000000000000000" target="_blank" >Justification of Logit and Probit
Models</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00531000000000000000" target="_blank" >The Latent Variable Approach</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00532000000000000000" target="_blank" >Extending the Latent Variable Approach</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00533000000000000000" target="_blank" >Estimation of Binary Response Models</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00534000000000000000" target="_blank" >Goodness-of-Fit and Model Selection</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00535000000000000000" target="_blank" >Hypothesis Testing and Statistical Inference</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00540000000000000000" target="_blank" >Interpreting Estimates</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00541000000000000000" target="_blank" >The Odds-Ratio</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00542000000000000000" target="_blank" >Marginal Effects</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00543000000000000000" target="_blank" >An Application Using Individual-Level Data</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00550000000000000000" target="_blank" >Alternative Probability Models</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00551000000000000000" target="_blank" >The Complementary Log-Log Model</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00552000000000000000" target="_blank" >Programming Binomial Response Models</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00560000000000000000" target="_blank" >Summary</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00600000000000000000" target="_blank" >Loglinear Models for Contingency Tables</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00610000000000000000" target="_blank" >Contingency Tables</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00611000000000000000" target="_blank" >Types of Contingency Tables</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00612000000000000000" target="_blank" >An Example and Notation</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00613000000000000000" target="_blank" >Independence and the Pearson <!-- MATH: $\protect\pmb\chi ^{2}$ --><IMG src="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/img11.gif" align=middle border=0> Statistic</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00620000000000000000" target="_blank" >Measures of Association</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00621000000000000000" target="_blank" >Homogeneous Proportions</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00622000000000000000" target="_blank" >Relative Risks</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00623000000000000000" target="_blank" >Odds-Ratios</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00624000000000000000" target="_blank" >The Invariance Property of Odds-Ratios</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00630000000000000000" target="_blank" >Estimation and Goodness-of-Fit</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00631000000000000000" target="_blank" >Simple Models and the Pearson <!-- MATH: $\protect\pmb\chi ^{2}$ --><IMG src="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/img11.gif" align=middle border=0> Statistic</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00632000000000000000" target="_blank" >Sampling Models and Maximum Likelihood
Estimation</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00633000000000000000" target="_blank" >The Likelihood-Ratio Chi-Squared Statistic</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00634000000000000000" target="_blank" >Bayesian Information Criterion</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00640000000000000000" target="_blank" >Models for Two-Way Tables</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00641000000000000000" target="_blank" >The General Setup</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00642000000000000000" target="_blank" >Normalization</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00643000000000000000" target="_blank" >Interpretation of Parameters</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00644000000000000000" target="_blank" >Topological Model</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00645000000000000000" target="_blank" >Quasi-Independence Model</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00646000000000000000" target="_blank" >Symmetry and Quasi-Symmetry</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00647000000000000000" target="_blank" >Crossings Model</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00650000000000000000" target="_blank" >Models for Ordinal Variables</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00651000000000000000" target="_blank" >Linear-by-Linear Association</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00652000000000000000" target="_blank" >Uniform Association</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00653000000000000000" target="_blank" >Row-Effect and Column-Effect Models</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00654000000000000000" target="_blank" >Goodman's <IMG src="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/img13.gif" align=bottom border=0> Model</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00660000000000000000" target="_blank" >Models for Multiway Tables</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00661000000000000000" target="_blank" >Three-Way Tables</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00662000000000000000" target="_blank" >The Saturated Model for Three-Way Tables</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00663000000000000000" target="_blank" >Collapsibility</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00664000000000000000" target="_blank" >Classes of Models for Three-Way Tables</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00665000000000000000" target="_blank" >Analysis of Variation in Association</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00666000000000000000" target="_blank" >Model Selection</A> </LI></UL></LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00700000000000000000" target="_blank" >Statistical Models for Rates</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00710000000000000000" target="_blank" >Introduction</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00720000000000000000" target="_blank" >Log-Rate Models</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00721000000000000000" target="_blank" >The Role of Exposure</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00722000000000000000" target="_blank" >Estimating Log-Rate Models</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00723000000000000000" target="_blank" >Illustration</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00724000000000000000" target="_blank" >Interpretation</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00730000000000000000" target="_blank" >Discrete-Time Hazard Models</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00731000000000000000" target="_blank" >Data Structure</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00732000000000000000" target="_blank" >Estimation</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00740000000000000000" target="_blank" >Semiparametric Rate Models</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00741000000000000000" target="_blank" >The Piecewise Constant Exponential Model</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00742000000000000000" target="_blank" >The Cox Model</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00750000000000000000" target="_blank" >Models for Panel Data</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00751000000000000000" target="_blank" >Fixed Effects Models for Binary Data</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00752000000000000000" target="_blank" >Random Effects Models for Binary Data</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00760000000000000000" target="_blank" >Unobserved Heterogeneity in Event-History Models</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00761000000000000000" target="_blank" >The Gamma Mixture Model</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00770000000000000000" target="_blank" >Summary</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00800000000000000000" target="_blank" >Models for Ordinal Dependent Variables</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00810000000000000000" target="_blank" >Introduction</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00820000000000000000" target="_blank" >Scoring Methods</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00821000000000000000" target="_blank" >Integer Scoring</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00822000000000000000" target="_blank" >Midpoint Scoring</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00823000000000000000" target="_blank" >Normal Score Transformation</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00824000000000000000" target="_blank" >Scaling with Additional Information</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00830000000000000000" target="_blank" >Logit Models for Grouped Data</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00831000000000000000" target="_blank" >Baseline, Adjacent, and Cumulative Logits</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00832000000000000000" target="_blank" >Adjacent Category Logit Model</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00833000000000000000" target="_blank" >Adjacent Category Logit Models and Loglinear Models</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00840000000000000000" target="_blank" >Ordered Logit and Probit Models</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00841000000000000000" target="_blank" >Cumulative Logits and Probits</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00842000000000000000" target="_blank" >The Ordered Logit Model</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00843000000000000000" target="_blank" >The Ordered Probit Model</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00844000000000000000" target="_blank" >The Latent Variable Approach</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00845000000000000000" target="_blank" >Estimation</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00846000000000000000" target="_blank" >Marginal Effects</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00850000000000000000" target="_blank" >Summary</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00900000000000000000" target="_blank" >Models for Unordered Dependent Variables</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00910000000000000000" target="_blank" >Introduction</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00920000000000000000" target="_blank" >Multinomial Logit Models</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00921000000000000000" target="_blank" >Review of the Binary Logit Model</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00922000000000000000" target="_blank" >General Setup for the Multinomial Logit
Model</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00930000000000000000" target="_blank" >The Standard Multinomial Logit
Model</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00931000000000000000" target="_blank" >Estimation</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00932000000000000000" target="_blank" >Interpreting Results from Multinomial Logit
Models</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00940000000000000000" target="_blank" >Loglinear Models for Grouped Data</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00941000000000000000" target="_blank" >Two-Way Tables</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00942000000000000000" target="_blank" >Three- and Higher-Way Tables</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00950000000000000000" target="_blank" >The Latent Variable Approach</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00960000000000000000" target="_blank" >The Conditional Logit Model</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00961000000000000000" target="_blank" >Interpretation</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00962000000000000000" target="_blank" >The Mixed Model</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00970000000000000000" target="_blank" >Specification Issues</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00971000000000000000" target="_blank" >Independence of Irrelevant Alternatives:
The IIA Assumption</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00972000000000000000" target="_blank" >Sequential Logit Models</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION00980000000000000000" target="_blank" >Summary</A> </LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION001000000000000000000" target="_blank" >The Matrix Approach to Regression</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION001010000000000000000" target="_blank" >Introduction</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION001020000000000000000" target="_blank" >Matrix Algebra</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION001021000000000000000" target="_blank" >The Matrix Approach to Regression</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION001022000000000000000" target="_blank" >Basic Matrix Operations</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION001023000000000000000" target="_blank" >Numerical Example</A> </LI></UL></LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION001100000000000000000" target="_blank" >Maximum Likelihood Estimation</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION001110000000000000000" target="_blank" >Introduction</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION001120000000000000000" target="_blank" >Basic Principles</A>
<UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION001121000000000000000" target="_blank" >Example 1: Binomial Proportion</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION001122000000000000000" target="_blank" >Example 2: Normal Mean and Variance</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION001123000000000000000" target="_blank" >Example 3: Binary Logit Model</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION001124000000000000000" target="_blank" >Example 4: Loglinear Model</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION001125000000000000000" target="_blank" >Iteratively Reweighted Least Squares</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION001126000000000000000" target="_blank" >Generalized Linear Models</A>
<LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION001127000000000000000" target="_blank" >Minimum <!-- MATH: $\pmb{\chi^2}$ --><IMG src="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/img11.gif" align=middle border=0> Estimation</A> </LI></UL></LI></UL><LI><a href="http://www.la.utexas.edu/research/faculty/dpowers/book/htmlbook/book.html#SECTION001200000000000000000" target="_blank" >Bibliography</A> </LI></UL><!--End of Table of Contents--><!--SKIP
<H1><A>
Preface</A></H1>
In this book, we intend to give a comprehensive introduction to methods and
models for the analysis of categorical data and their applications in social
science research. The primary audiences are graduate students and
practicing researchers in social science. The book also serves as a
reference.
One feature that distinguishes our book from other books on the topic is our
explicit aim to integrate the transformational approach and the latent
variable approach, two diverse but complementary traditions dealing with the
analysis of categorical data. The statistical, or transformational, approach
to categorical data analysis is most familiar to researchers in demography
and biostatistics, whereas the latent variable approach is often taken by
economists. A discussion of the two approaches is given in Chapter 1.
We assume that the reader has prior knowledge such as that covered
in a typical applied regression course but not necessarily in advanced
mathematical statistics. Although some technical details are unavoidable
in a book like this, we make the book accessible by resorting to
substantive examples. Some readers may wish to skip portions of the book
that are technical without losing much appreciation of the book.
To utilize the internet technology fully, we have set up a website
for the book at
http://www.la.utexas.edu/research/faculty/dpowers/book.<a href="#foot111" target="_blank" ><SUP>1.1</SUP></A>
The website contains the data sets and the programming codes
in several popular statistical packages (e.g., GLIM [Numerical
Algorithms Group 1986], LIMDEP [Greene 1995], SAS [SAS Institute 1990],
STATA [Stata Corporation 1995], and TDA [Rowher 1995]) for the examples
discussed in the book. The website provides some GLIM macros and
GAUSS (Aptech Systems 1997) subroutines to illustrate details of estimation
as well as several applications of specialized programs for models that
cannot be estimated in a standard software package. We will continue to update
the website (1) to provide exercises, (2) to add new examples,
(3) to expand to other software packages, and (4) to provide other
related materials.
<H2><A>
Use of This Text in a Course on Categorical Data Models</A></H2>
This book is appropriate for a single-term course in categorical data
modeling. Chapters 1 and 2 provide an introduction and basic foundation
for the course. Our view is that, regardless of the type of data, a
regression-type modeling approach can be an appropriate analytic method.
Chapter 3 provides an introduction and detailed treatment of regression
models for binary data. Chapter 4 goes into greater detail on the
methods for analyzing contingency tables. Chapter 5 discusses models for
transition rates. The core sections include Sections 5.1-5.3. Sections
5.4-5.6 can be omitted without loss of continuity. Chapters 6 and 7
provide an overview of methods for ordered and nonordered categorical
responses. This material is linked to the contingency table approach of
Chapter 4 and the latent variable framework outlined in Chapter 3.
<H2><A>
Acknowledgments</A></H2>
At various stages of the book project, we benefited from the
encouragement of and association with the following scholars: Paul
Allison, Mark Becker, John Fox, Richard Gonzalez, Leo Goodman, David
Grusky, Robert Hauser, Michael Hout, Kenneth Land, Scott Long, Charles
Manski, Robert Mare, Bill Mason, Susan Murphy, Trond Peterson, Adrian Raftery,
Steve Raudenbush, Arthur Sakamoto, Herbert Smith, Michael Sobel, Chris Winship, Larry Wu, and
Kazuo Yamaguchi. In addition, we extend our gratitude to many graduate
students who have taken statistics courses from us and inspired us to
write the book.
A Dean's Fellowship at the University of Texas at Austin to Dan Powers,
a National Science Foundation's Young Investigator Award to Yu Xie, and
University of Michigan's internal funds to Yu Xie provided partial
support for this project.
We also thank the external reviewers for providing valuable critiques
on early versions of the manuscript and Pam Bennett, John Fox,
Kimberly Goyette, and James Raymo for carefully proofreading the final
version of the manuscript and providing programming examples.
We alone are responsible for errors that remain. Last, but not least,
we thank J. Scott Bentley, our editor at Academic Press, for initiating
the project and then making efforts to bring it to completion.
Daniel A. Powers
Yu Xie
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