dif.strata.variance: Stratified DIF Variance

In sirt: Supplementary Item Response Theory Models

Stratified DIF Variance

Description

Calculation of stratified DIF variance

Usage

dif.strata.variance(dif, se.dif, itemcluster)

Arguments

dif	Vector of uniform DIF effects
se.dif	Standard error of uniform DIF effects
itemcluster	Vector of item strata

Value

A list with following entries:

stratadif	Summary statistics of DIF effects within item strata
weighted.DIFSD	Weighted DIF standard deviation
unweigted.DIFSD	DIF standard deviation

References

Longford, N. T., Holland, P. W., & Thayer, D. T. (1993). Stability of the MH D-DIF statistics across populations. In P. W. Holland & H. Wainer (Eds.). Differential Item Functioning (pp. 171-196). Hillsdale, NJ: Erlbaum.

See Also

See dif.logistic.regression for examples.

sirt documentation built on May 29, 2024, 8:43 a.m.