Author Topic: Resolving uniform DIF  (Read 395 times)

oysteg

  • Guest
Resolving uniform DIF
« on: July 04, 2015, 11:24:12 AM »
Hi
Items carrying non-uniform DIF are usually deleted from a test. Items with uniform DIF (e.g. related to gender) might be split into as many "virtual items" as there are person factor levels (male and female). Is there a split procedure for resolving uniform DIF in ConQuest? If not, would you recommend copying the item and removing data for one person factor level for each item (one item with missing data for males and the other with missing data for females) and rerun the location estimation for all perons and items?
Regards, Nanco

Eveline Gebhardt

  • Administrator
  • Full Member
  • *****
  • Posts: 103
    • View Profile
    • Email
Re: Resolving uniform DIF
« Reply #1 on: July 16, 2015, 01:05:42 AM »
Hi Nanco

You need to change the data file. That is, recode responses to not administered for one group in one version of the item and for the other group in the other version of the item.

I hope this helps.

Best wishes
Eveline