Open AccessESTIMATING ITEM CHARACTERISTIC CURVES WITHOUT KNOWLEDGE OF THEIR MATHEMATICAL FORM *
Author(s) -
Lord Frederic M.
Publication year - 1968
Publication title -
ets research bulletin series
Language(s) - English
Resource type - Journals
eISSN - 2333-8504
pISSN - 0424-6144
DOI - 10.1002/j.2333-8504.1968.tb00159.x
Subject(s) - mathematics , test (biology) , logistic function , statistics , paleontology , biology
A method is outlined for estimating item characteristic curves without knowledge of their mathematical form. For illustrative purposes, the method is applied to five items from a regular test administration. Previously, curves had been estimated for these same items on the assumption that all were of logistic form. Surprising agreement was found between the results obtained from the two unrelated methods.