PDFILE= person deletion file

Deletion or selection of persons from a test to be analyzed, but without removing their responses from your data file, is easily accomplished by creating a file in which each line contains the sequence number of a person or persons to be deleted or selected (according to the same rules given under IDFILE=), and then specifying this file by means of the control variable, PDFILE=, or enter the deletion list in the control file using PDFILE=*. PDFILE=filename can be action from the Specification menu dialog box. See also PDELETE=.


PDFILE= file name

file containing list of person entry numbers to be deleted or reinstated.  Each line in the file is in the PDELETE= format.


opens a Browser window to find the file


in-line list in the control file

PDFILE=* 4 18-23 *

At the Extra Specifications prompt


In the Specifications Menu dialog box, reinstates all temporary deletions


Example 1: You wish to delete the fifth and tenth persons from this analysis.

1. Create a file named, say, "PERSON.DEL"

  2. Enter into the file, the lines:



3. Specify, in the control file,



 or, enter directly into the control file,






Example 2: The analyst wants to delete the most misfitting persons reported in Table 6.

1. Set up a standard control file.

2. Specify



3. Copy the target portion of Table 6.

4. Paste it between the "*"

5. Delete characters before the entry numbers.

6. Type ; after the entry numbers to make further numbers into comments.


Example 3:

TITLE = 'Example of person deletion list from Table 6'


 Delete the border character before the entry number

; ENTRY   RAW                          INFIT     OUTFIT              


   73   ; 21    22      .14     .37  .95   -.3 1.03    .2 B-.19  SAN 

   75   ; 16    22     -.56     .39  .95   -.3 1.03    .2 C-.19  PAU 

        Enter the ; to make other numbers into comments

*    ; closure of PDFILE=*


Example 4: My sample is large enough (n>2000). I want to exclude in the analysis the persons and items that have infit or outfit statistics of less than -2 or greater than +2.


1. Perform your analysis.

2. Output files menu: PFILE to Excel.

3. In Excel sort the persons in Outfit ZSTD order.

4. Delete all person rows you want to keep in your analysis.

5. Copy the column of entry numbers of persons you want to delete.

6. Create a new text file "delete.txt"

7. Paste the list of entry numbers into the text file

8. In your Winsteps control file, add

PDFILE = delete.txt

9. Perform your revised analysis

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Rasch Publications
Rasch Measurement Transactions (free, online) Rasch Measurement research papers (free, online) Probabilistic Models for Some Intelligence and Attainment Tests, Georg Rasch Applying the Rasch Model 3rd. Ed., Bond & Fox Best Test Design, Wright & Stone
Rating Scale Analysis, Wright & Masters Introduction to Rasch Measurement, E. Smith & R. Smith Introduction to Many-Facet Rasch Measurement, Thomas Eckes Invariant Measurement with Raters and Rating Scales: Rasch Models for Rater-Mediated Assessments, George Engelhard, Jr. & Stefanie Wind Statistical Analyses for Language Testers, Rita Green
Rasch Models: Foundations, Recent Developments, and Applications, Fischer & Molenaar Journal of Applied Measurement Rasch models for measurement, David Andrich Constructing Measures, Mark Wilson Rasch Analysis in the Human Sciences, Boone, Stave, Yale
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