Open AccessWHAT EFFECT DOES THE INCLUSION OR EXCLUSION OF REPEATERS HAVE ON TEST EQUATING?
Author(s) -
Puhan Gautam
Publication year - 2009
Publication title -
ets research report series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.235
H-Index - 5
ISSN - 2330-8516
DOI - 10.1002/j.2333-8504.2009.tb02176.x
Subject(s) - equating , sample (material) , inclusion (mineral) , test (biology) , statistics , sample size determination , inclusion–exclusion principle , psychology , econometrics , mathematics , social psychology , chromatography , paleontology , chemistry , politics , political science , law , rasch model , biology
This study investigated the effect of inclusion or exclusion of test repeaters on equating results. New forms of two tests were equated to their respective old forms using either all examinees or only the first‐time examinees in the new form sample. Since the old forms were the first forms administered for these tests, there were no repeaters and therefore the old form samples were unaltered. Results showed that for both tests, inclusion or exclusion of repeaters in the new form sample had very little impact on the final equating results. These findings do not provide enough evidence to support routine exclusion of repeaters from the equating sample before conducting the equating. Finally, some examples of simple analyses to assist the testing practitioner when making a judgment about whether including or excluding repeaters in the equating sample is reasonable are provided.