[Rasch] OPLM

Rama Guinda guinda36 at hotmail.com
Wed Jul 5 16:31:17 EST 2006

Dear All,
Could you please answer this question.
What is OPLM?
I know that it stands for one parameter logistic model and is also the
name of a Rasch programme written by  Norman Verhelst in the
Is it basically the simple Rasch model or a special extension of  it?
How is it different from the Rasch model?

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