ISRANGE= category range of an item group

By default, Winsteps deduces the range of categories of  an item group from the data. ISRANGE= or ICRANGE= states the range of category numbers explicitly. This is useful with SFUNCTION=

 

 

The Item Entry Number is for any item in the ISGROUPS= group. All items in the group have the same category range.

 

Example1 : For the Olympic Ice-Skating in Exam15.txt, the rating scale range is 0-60 though the observed range is 29-60. All items (raters) share the same rating scale.

 

ISRANGE=*

2 00 60   ; 2 is an example rater number in the group

*

 

Example 2: there are 25 Partial Credit items. All have the range 0-4

 

ISGROUPS=0

ISRANGE=*

1-25 0 4  

*