UAMOVE= move all anchor values a pre-set amount = 0 |
Anchor (fixed) values for the persons are specified by PAFILE= and for the items by IAFILE=. All the anchor values can be increased or decreased by the same amount using UAMOVE=. The value is applied before any rescaling with UASCALE= or USCALE=. UIMEAN= and UPMEAN= are ignored.
Reported values = USCALE= * (UAMOVE= + anchor value)/UASCALE=
Example 1: All anchor values are to be increased by 1.5 units for this analysis:
IAFILE = *
12 2.5 ; the anchor value for item 12 is 2.5 units
*
UAMOVE = 1.5 ; the amount by which to increase the anchor values
Item 12 will be reported in Table 14 with an anchor value "A" of 2.5 + 1.5 = 4.0 logits.
Example 2: Anchor values in logits centered on 0. Report values to be user-scaled 100 units per logit, centered on 500.
UASCALE=1
USCALE=100
UAMOVE = 500/100 = 5
IAFILE=*
1 0.5 ; 0.5 logits
*
Reported value for item 1 anchor value = 0.5 logits = 100 * (5 + 0.5) = 550 user-units
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