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Decomposition of a Rasch Partial Credit Item into Independent Binary and Indecomposable Trinary Items
Huynh Huynh
Journal:

Psychometrika / Volume 61 / Issue 1 / March 1996

Published online by Cambridge University Press:

01 January 2025, pp. 31-39
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For each Rasch (Masters) partial credit item, there exists a set of independent Rasch binary and indecomposable trinary items for which the sum of the scores and the partial credit score have identical probability density functions. If each indecomposable trinary item is further expressed as the sum of two binary items, then the binary items are positively dependent and cannot be both of the Rasch type.

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