[S] multiple graded respons

[<hans.coppenolle@agr.kuleuven.ac.be> (Hans Coppenolle)]

Someone has experience with multiple graded respons models
as   samejima's graded repons model, wich is a latent trait model
for polytonomous manifest variables with a continuous latent variable?
Is there s-plus code available? Or someone knows other software programs?

Thanckx in advance!
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