underidentified

adj

adj

Etymology From under- + identified.

Insufficiently identified.

We also note that the special case in which the b parameter is set a priori to 1 is underidentified and requires an arbitrary constraint on one item parameter or, equivalently, on the a distribution parameter.2015 November 7, “A New Extension of the Binomial Error Model for Responses to Items of Varying Difficulty in Educational Testing and Attitude Surveys”, in PLOS ONE, →DOI:

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