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: Write out the Table of inter-person residual correlations. PCORFIL=file.txt - Then file.txt contains, for SF.txt,

 Person Person Correlation

 1 3 .23

 1 4 -.31

 1 5 .13

 .....

 3 4 -.10

 3 5 -.02

 .....

 

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

 

 

This produces:

 1.0000   .2265  -.3147   .1306  ....

  .2265  1.0000  -.1048  -.0222  ....

 -.3147  -.1048  1.0000   .0403  ....

 ......  ......  ......  ......  ....