[Rasch] Differential Item Functioning: Help Needed

Mike Linacre rmt at rasch.org
Wed Feb 6 19:30:54 EST 2013

Yes, Rense, the DIF nomogram shows binary items.

For polytomous items, the sample sizes would be smaller, probably by about 20% for a 3-category item.

Mike L.

On 2/5/2013 22:53 PM, Rense Lange wrote:
> About right - but I haven't seen enough dif > 1 logit to be sure about the larger differences. These are binary items, correct?
> Rense

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