[Rasch] Comparison Rasch 3-parm IRT

Mike Linacre mike at winsteps.com
Sun Sep 15 08:32:51 EST 2013

Yes, Ricardo.

Ben Wright reached the same conclusion in his reanalysis of a major 
dataset: "3PL ability estimates and item difficulties are statistically 
equivalent to Rasch measures." - http://www.rasch.org/rmt/rmt91b.htm

Mike L.

On 9/14/2013 5:20 AM, Ricardo Primi wrote:
> Thanks a lot Mike
> It is interesting that then both models will tell the same history about the subjects (practically the same theta estimates and same S.E.)
> Thanks
> Ricardo

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