How to do 3-PL or 4-PL IRT model PreviousNext
Mplus Discussion > Categorical Data Modeling >
 Caoshang posted on Saturday, May 07, 2011 - 11:23 pm
Dear professor:
I want to do the 3-parameter IRT model:
a= item difficulty
b= item discrimination
c= item ¡°guessing¡±

4-parameter model:
add d= item 'carelessness'

Can you give me some examples or advice of how to write the code to set this up in Mplus.i can't get any useful information ,especially typically examples from the Internet.

thank you for your patience.
 Linda K. Muthen posted on Sunday, May 08, 2011 - 6:22 am
Mplus handles only a and b. For this, see Example 5.5.
 Matthew E Foster posted on Thursday, April 09, 2015 - 12:25 pm
Since this post in 2011, has Mplus added features so that it can estimate a 3 parameter logistic model?

Thank you for your time.
 Bengt O. Muthen posted on Thursday, April 09, 2015 - 12:58 pm
It's in development.
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