A Short Introduction to Stata for Biostatistics Updated to Stata 11 (book + CD with data and results of exercises)
Timberlake Consultants Press
Author: Michael Hills and Bianca L. De Stavola
Publisher: Timberlake Consultants Press
ISBN-10: 978-0-9557076-4-3
Copyright: 2009
Pages: 188 pages
Price: £25 + P&P
Contact us to purchase
Description
This book provides a short but comprehensive introduction to the statistical software in Stata. It is meant to be read while sitting in front of a computer running Stata, and comes with a CD-ROM containing a variety of data sets which are used to illustrate the different Stata commands. Although written with biostatisticians in mind, much of the material is equally relevant to other disciplines. Topics covered include basic commands, dialog boxes, housekeeping, data input, graphics, data management, regression models, testing hypotheses, survival data, and Stata programming. There are many exercises, and solutions are provided by program rather than printed as part of the book.
This edition has been updated to Stata 11 and includes a new section on competing risks and new chapters on reporting results and meta analysis.
Preface
Starting to use Stata is relatively simple, but because of its size, and the wealth of information in the documentation, the question of what comes next can be rather daunting. This book provides a short introduction which will help answer this question. Although written with biostatisticians in mind, much of the material in the book is equally relevant to other disciplines. We believe that the only way to learn Stata is to try it out, so we assume that the reader is seated in front of a computer which is running Stata. For this reason we have not felt it necessary to print the output which follows Stata commands. Of course there are occasions when it is reassuring to see that the output on the screen is the same as the output on the page, and we occasionally include some output for this reason, but the spirit of the book is to try something and see what happens. In keeping with this we have not provided solutions to the exercises, but instead a program produces the solutions on the screen.
We have mostly used official Stata commands but, as one of the features of Stata is the large number of user{contributed commands, we have also felt free to use a few of these, where appropriate. In particular, Chapters 10 { 12 depend on two commands, written specially for this book, which provide dialog boxes for making tables and estimating effects. The ideas in these chapters arose from courses taught jointly by Michael Hills and David Clayton, and we gratefully acknowledge David's contribution. The data sets and additional program files are an integral part of the book. They are included on the CD-ROM which comes with the book, but are also available as a download from
www.timberlake.co.uk or
www.stata.com. Instructions on how to proceed with each of these media are given in Chapter 0: Getting Started. This edition of the book has been updated to Stata 11, a major update from Stata 10, and includes a description of factor variables, a new section on competing risks, and new chapters on exporting results for publication and meta analysis. We should be grateful to be notified of any errors.
Contents
0 Getting started
1 Some basic commands
1.1 The births data
1.2 A first look at the data
1.3 Tables of frequencies
1.4 Tables of means and other things
1.5 Restricting the scope of commands
1.6 Generating new variables
1.7 Ordering, dropping and keeping
1.8 Sorting data
1.9 Using Stata as a calculator
1.10 Shortcuts
1.11 Stata syntax
1.12 Using the Stata help facilities
2 Tabs, menus and dialog boxes
2.1 Where to find the dialog boxes
2.2 A first look at the data
2.3 Tables of frequencies
2.4 Tables of means and other things
2.5 Restricting the scope of commands
2.6 Generating new variables
2.7 Ordering, dropping and keeping
2.8 Sorting data
2.9 Using Stata as a calculator
3 Housekeeping
3.1 Labelling a data set
3.2 Notes
3.3 Labelling variables and their values
3.4 Data types and display formats
3.5 The variables manager
3.6 Recoding a variable
3.7 Missing values
3.8 Dates
3.9 Saving files
3.10 Log files
3.11 Do files
4 Data input and output
4.1 Data sources
4.2 Data from a spreadsheet
4.3 Data from a word processor
4.4 Large data sets
4.5 Loading data from the keyboard
4.6 Data output
5 Graph commands
5.1 Box plots
5.2 Histograms
5.3 Scatter plots
5.4 Overlaying graphs
5.5 Line plots
5.6 Cumulative distribution plots
5.7 Adding lines
5.8 Graph titles
5.9 Titles and labels for axes
5.10 Naming, saving, and combining graphs
5.11 Printing and exporting graphs
5.12 Schemes
5.13 Help for graphics
6 Graph dialog boxes
6.1 Histograms
6.2 Box plots
6.3 Bar charts
6.4 Twoway graphs
6.5 The graph editor
7 More basic tools
7.1 The return list
7.2 Generating variables using functions
7.3 Grouping the values of a variable
7.4 Comparing two means
7.5 Weights
7.6 Repeating commands for different sub-groups
7.7 Repeating commands for different variables
8 Data management
8.1 Cleaning data
8.2 String variables
8.3 Appending to add more subjects
8.4 Merging to add more variables
8.5 m:1 and 1:m merges
8.6 Sequential merges
8.7 Merging to update variables
9 Repeated measurements
9.1 Wide and long coding
9.2 Graphing repeated measures
9.3 Working at the group level
9.4 Collapsing the data
9.5 Reshaping from long to wide and vice versa
9.6 Use of system variables with by
10 Response and explanatory variables
10.1 Questions in statistical analysis
10.2 Producing tables with tabmore
10.3 A second explanatory variable
10.4 Odds
10.5 Case-control studies
10.6 Survival data and rates
10.7 Count data and rates
11 Measuring effects
11.1 A metric response
11.2 A binary response
11.3 Case-control studies
11.4 A failure response
11.5 Metric exposure variables
11.6 Metric versus grouped
12 Stratifying and controlling
12.1 Stratification
12.2 Controlling
12.3 Controlling the effect of a metric exposure
12.4 Metric control variables
12.5 Metric versus grouped
13 Regression commands
13.1 Three important regression models
13.2 A metric exposure
13.3 Categorical exposures
13.4 Ratios of odds, proportions, and rates
13.5 Fitted values and residuals
13.6 Case-control studies
14 Tests of hypotheses
14.1 Models and Likelihood
14.2 Log likelihood
14.3 Likelihood ratio and Wald tests in Stata
14.4 Joint tests of several parameters
14.5 Other regression commands
15 Controlling and stratifying with regression
15.1 Controlling with regression commands
15.2 Testing effects after controlling
15.3 Testing for effect modification and interactions
15.4 Interactions with metric variables
15.5 Stratifying with regression commands
15.6 Categorical variables in models before Stata 11
16 Mantel-Haenszel methods
15.1 Controlling with regression commands
15.2 Testing effects after controlling
15.3 Testing for effect modification and interactions
15.4 Interactions with metric variables
15.5 Stratifying with regression commands
15.6 Categorical variables in models before Stata 11
17 Survival data and stset
17.1 The response in survival data
17.2 Summarizing survival time
17.3 Calculating rates and rate ratios
17.4 Cumulative rate plots
17.5 Variables created by stset
17.6 Rates that vary with time
17.7 Cox regression
17.8 Checking the proportional hazards assumption
17.9 A metric exposure
17.10 Time updated exposures
17.11 Competing risks
18 Different time scales and standardization
18.1 Follow-up time
18.2 Rates that change with time
18.3 Two time-scales
18.4 Standardization
19 Meta-analysis
19.1 Background
19.2 Data
19.3 Pooled effect
19.4 Fixed effect summary
19.5 Random effects summary
19.6 Sources of heterogeneity
19.7 Funnel plots
19.8 Fixed or random effects?
20 Writing Stata programs
20.1 Starting with a do file
20.2 Making the do file into an ado file
20.3 Cutting out unwanted output
20.4 Making the program accept arguments
20.5 Allowing if, in, and options
20.6 Clearing programs from memory
20.7 Another example: counting distinct values
21 Exporting results
21.1 Copy and paste
21.2 Formatting results for the screen
21.3 Formatting results for a word processor
21.4 Formatting results for LATEX
21.5 Other commands for processing output
22 How Stata is organized
22.1 Paths and programs
22.2 Updating Stata
22.3 The Stata Journal
22.4 User-contributed commands
22.5 The Statalist
22.6 Other sources of help
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