[Rasch] splitting items - DIF - more than 2 groups

Mike Linacre mike at winsteps.com
Tue Mar 7 11:42:30 AEDT 2017


Occam's razor tells us "minimize the pseudo-items". That also simplifies 
explanations: "One group is different, so its item is separated."

Mike L.

On 3/6/2017 6:30 AM, Randy and Shelley MacIntosh wrote:
> a post-hoc test shows only 1 of the groups is different from the other 
> two.
> Is it appropriate to split this item into 3 pseudo-items or just 2 
> (one for the group that differs and one for the 2 groups are are the 
> same)?

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