For backwards compatibility only.

 

UANCHOR= simplifies conversion from previously computed logit measures to user-scaled measures.

 

If UASCALE<>0.0 then UANCHOR=A is forced.

If UASCALE=0.0 then UANCHOR=N is forced.

 

UANCHOR=A or N or L specifies that the anchor values are in UASCALE= units per logit. Reported measures will be user-rescaled by UMEAN= (or UIMEAN= or UPMEAN=) and USCALE=.

 

Logit measure = anchored measure/UASCALE - UMEAN/USCALE

 

UANCHOR=Y specifies that anchor values are in USCALE= units per logit.

 

Example 1: Your item bank calibrations are user-scaled with 10 units per logits, but you want to report person measures in CHIPS (BTD p.201):

UASCALE=10  ; user-scaling of anchor values

UANCHOR=A

USCALE=4.55

 

Example 2: Your previous test was in logits, but now you want the user-scaling 100 per logit.

UASCALE=1  ; user-scaling of anchor values: logits

UANCHOR=Logits

USCALE=100