Millisecond Forums » Millisecond Forums » Inquisit 5 » How to calculate Cronbach's alpha of IAT ?

How to calculate Cronbach's alpha of IAT ?

LIN — Mon, 26 Dec 2016 18:11:18 GMT

Hi !

I am confused with how to calculate Cronbach's alpha of IAT ,
and I think that the calculation of Cronbach's alpha of IAT and ST-IAT will be the same ,right?

It will be kind of you if you can tell me how to resolve this problem.

Thank you very much!

RE: How to calculate Cronbach's alpha of IAT ?

LIN — Mon, 26 Dec 2016 18:11:18 GMT

[quote]

[b]Dave - Monday, December 26, 2016[/b]

[quote]

[b]LIN - Sunday, December 25, 2016[/b]

[/quote]

If you want to calculate Cronbach's alpha, you essentially
- compute difference scores for every single trial of the combined blocks,
- treat those as separate items, and
- calculate alpha over that.

I'll note that the more common (and easier) approach to assess IAT reliability is some variation of split-half reliability, e.g. calculation the correlation between the D-score for the 1st combined blocks (da) and the D-score for the 2nd combined blocks (db). https://faculty.washington.edu/agg/pdf/Schnabel%20&%20al.Hbk_2008.proofs.pdf gives a short overview of the various approaches.

[/quote]

Dear DAVE
Thank you for your response,
it's really a great help to me!

RE: How to calculate Cronbach's alpha of IAT ?

Dave — Mon, 26 Dec 2016 09:18:22 GMT

[quote]

[b]LIN - Sunday, December 25, 2016[/b]

[/quote]