DPF= specifies the part of the item label which is to be used for classifying items in order to identify Differential Person Function (DPF) - uniform or non-uniform - using the column selection rules. See also DPF Table and DIF and DPF considerations.

 

 

See ISUBTOTAL for format.

 

See DPF Table 31.

 

Example 1: Columns 3 and 4 of the item label (between &END and END LABELS) contains content-area code:

 DPF = $S3E4 ; start in column 3 and end in column 4 of item label

 tfile=*

 31  ; Table 31 is DPF Table (or use Output Tables menu)

 *

 

Example 2: Columns 3 of the item label contains a content code. Column 5-6 have a complexity code. Two independent DIF analyses are needed:

 

 DPF = *

 $S3W1  ; content analysis

 $S5W2  ; complexity

 *

 tfile=*

 31  ; Table 31 is DPF Table (or use Output Tables menu)

 *