This writes out the Table of inter-person correlations which is the basis of the principal components analysis of residuals. The basis for the correlations is controlled by PRCOMP=.

PRCOMP=R correlates the raw residuals

PRCOMP=S correlates the standardized residuals

PRCOMP=O correlates the observations

 

Extreme scores: minimum possible (0) and maximum possible (perfect) item scores are omitted from the computation of the correlations. Persons with extreme scores are not reported. Their correlation is 0.

 

Missing data: for these Winsteps substitutes their expectations when possible. For residuals and standardized residuals, these are 0. Items with extreme scores (minimum possible or maximum possible): Winsteps drops these from the correlation computation. The reason for these choices is to make the principal components analysis of residuals as meaningful as possible.

 

PCORFILE=? opens a Browse window

 

Example 1: Write out the Table of inter-person residual correlations. PCORFIL=file.txt - Then file.txt contains, for SF.txt, in 12-character, fixed-format, columns:

      PERSON      PERSON CORRELATION

           1           2     .028295

           1           3     .376179

           1           4     .457773

           1           5     .212332

           1           6    -.452587

           1           7     .338937

 .....

 

Example 2: When PCORFILE= is selected on the Output Files menu or MATRIX=YES, the Data Format: Matrix option can be selected:

 

 

This produces in 10-character wide columns:

        1         2         3         4

 1.000000   .028295   .376179   .457773

  .028295  1.000000   .460451  -.314252

  .376179   .460451  1.000000  -.083707

  .457773  -.314252  -.083707  1.000000

  .212332  -.258320  -.009482   .270427

 -.452587   .271853  -.443830  -.118054

  .338937  -.556438   .204127   .348083