DPF= columns within item label for Table 31 = $S1W1

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.

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)

               *