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THE IMPORTANCE OF CONTENT REPRESENTATION FOR COMMON‐ITEM EQUATING WITH NONRANDOM GROUPS
Author(s) -
KLEIN LAWRENCE W.,
JARJOURA DAVID
Publication year - 1985
Publication title -
journal of educational measurement
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.917
H-Index - 47
eISSN - 1745-3984
pISSN - 0022-0655
DOI - 10.1111/j.1745-3984.1985.tb01058.x
Subject(s) - equating , content (measure theory) , item response theory , statistics , representation (politics) , test (biology) , mathematics , item analysis , psychology , psychometrics , rasch model , mathematical analysis , paleontology , politics , political science , law , biology
The equating accuracy of content‐representative anchors versus nonrepresen‐tative but substantially longer anchors is compared. Content representation was defined as a match between anchors and total test of the percentage of items in each of several content areas. Through a chain of equatings it was found that content representation in anchors was critical for the testing program studied. The results are explained in terms of differences in mean profiles (by content area) of the nonrandom groups used for equating.