SAITEM= item numbers in SFILE= and SAFILE= (with one ISGROUPS=) = No

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Rating-scale Structure Files SFILE= and Structure Anchor Files SAFILE= (Rating (or partial credit) scale step anchoring files) have the format:

 

For only one active grouping in ISGROUPS=, or no ISGROUPS=

step-number

step-calibration

 

For multiple groupings in ISGROUPS=, or no ISGROUPS=

example-item-number in grouping

step-number

step-calibration

 

To specify that the multiple grouping format be used when there is only one active grouping, specify SAITEM=YES

 

Example: "Liking for Science" step anchor file:

Standard format for the Rating Scale model:

ISGROUPS= ; no groupings specified

SAFILE=*

1 -1.8 ; Rasch-Andrich threshold from category 0 to category 1

2 1.8 ; Rasch-Andrich threshold from category 1 to category 2

*

 

Alternative format allowing an example item number to identify the grouping, say item 10

SAITEM=Yes

SAFILE=*

10 1 -1.8

10 2 1.8

*