楼主: ckviewer
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[问答] [求助]SPSS中的KMO检验 |
高中生 75%
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回帖推荐Kaiser-Meyer-Olkin Measure of Sampling Adequacy是用于比较观测相关系数值与偏相关系数值的一个指标,其值愈逼近1,表明对这些变量进行因子分析的效果愈好.
The value of KMO should be. greater than 0.5 if the sample is adequate;
Factor analysis is a technique that requires a large sample size. Factor analysis is based on the correlation matrix of the variables involved, and correlations usually need a l ...
Not Positive Definite"--What Does It Mean?
Strictly speaking, a matrix is "positive definite" if all of its eigenvalues are positive. Eigenvalues are the elements of a vector, e, which results from the decomposition of a square matrix S as:
S = e'Me
To an extent, however, we can discuss positive definiteness in terms of the sign of the "determinant" of the matrix. The determinant is a scalar ...
The ProblemThere are four situations in which a researcher may get a message about a matrix being "not positive definite." The four situations can be very different in terms of their causes and cures.
First, the researcher may get a message saying that the input covariance or correlation matrix being analyzed is "not positive definite." Generalized least squares (GLS) estimation requires that th ...
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