Description Usage Arguments Value References See Also
mag
categorizes the DIF magnitudes
1 | mag(m, meth)
|
m |
value used for calculating DIF magnitudes |
meth |
type of method to calculate. Options include "zt" for logistic regression magnitude values suggested by Zumbo and Thomas (1997), and "ds" for the MH magnitude value categories from using ETS's delta scale (Holland & Thayer, 1985). This function is used to categorize DIF magnitudes in the functions
|
a character value representing the DIF magnitude categorization
Holland, P. W. and Thayer, D. T. (1985). An alternative definition of the ETS delta scale of item difficulty. Research Report RR-85-43. Princeton, NJ: Educational Testing Service.
Zumbo, B. D.,&Thomas, D. R. (1997). A measure of effect size for a model-based approach for studying DIF (Working paper of the Edgeworth Laboratory for Quantitative Behavioral Science). Prince George, Canada: University of Northern British Columbia.
LRd
for LR DIF method, MHd
for MH DIF method
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