UASCALE= the anchor user-scale value of 1 logit = 0

Specifies the number of units per logit of the anchor values.

UASCALE=0 - the anchor values are in the current output scale set with USCALE=

UASCALE= other value - this is the units per logit of the anchor values.

 

UIMEAN= and UPMEAN= are ignored when there are anchor values.

 

Example 1: The anchor values are user-scaled such that 1 logit is 45.5 units, so that differences of -100, -50, 0, +50, +100 correspond to success rates of 10%, 25%, 50%, 75%, 90%:

UASCALE = 45.5

; 1 logit = 45.4 user-units

USCALE = 1

report in logits

 

Example 2: The anchor values are on one scaling, but you want the reported values to be on another scaling.

UASCALE= 5

; there are 5 units per logit in the scaled values

USCALE=10

; you want 10 units per logit on the reported values

 

Example 3: The anchor measures are in logit scaling, the output measures are to be in user-scaling.

UASCALE= 1

; anchor values in logits

USCALE=30

; 30 user-units per logit

 

Example 4: Anchor measures are in same scaling as the output measures

UASCALE= 0

; anchor values in USCALE= scaling. 0 to ignore (default)

USCALE=user-value

; also used for anchor values

 

Example 5: Anchor values are scaled in Probits, not Logits

UASCALE = 0.588

; 1 logit = 0.588 probits

USCALE = 1

report in logits

 

Example 6: Anchor values are to be rescaled with a new range

IAFILE= (values)

the anchor values in anchor-value scaling

UASCALE= value

; anchor value scaling: on input anchor values converted to logits

UIMEAN=0

to set the internal base line

TFILE=*

in control file: done after analysis, but before reporting

USCALE=value

user-rescaling with new range

UIMEAN=value

user-rescaling with new offset

.......

any other instructions for TFILE=

*

 

 

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Rasch Books and Publications
Invariant Measurement: Using Rasch Models in the Social, Behavioral, and Health Sciences, 2nd Edn, 2024 George Engelhard, Jr. & Jue Wang Applying the Rasch Model (Winsteps, Facets) 4th Ed., Bond, Yan, Heene Advances in Rasch Analyses in the Human Sciences (Winsteps, Facets) 1st Ed., Boone, Staver Advances in Applications of Rasch Measurement in Science Education, X. Liu & W. J. Boone Rasch Analysis in the Human Sciences (Winsteps) Boone, Staver, Yale
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Rasch Models: Foundations, Recent Developments, and Applications, Fischer & Molenaar Probabilistic Models for Some Intelligence and Attainment Tests, Georg Rasch Rasch Models for Measurement, David Andrich Constructing Measures, Mark Wilson Best Test Design - free, Wright & Stone
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