returns a matrix with dims like resp matrix with expected scores and more ... func. by joerg-henrik heine jhheine(at)googlemail.com needs func. pvx in i.pvx.R and pvx.matrix in i.pvx.matrix.R Notation and formulas see: Wright & Masters 1982 p.100 in a revised form (korrigendum) see http://www.rasch.org/rmt/rmt34e.htm
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