Title page for ETD etd-02172010-020115
|Type of Document
||Lane, Carolyn Elizabeth Jones
||A comparison of the effects of conventional testing and two-stage testing procedures on item bias as defined by three statistical techniques.
||Educational Research and Evaluation
|Cross, Lawrence H.
|Frary, Robert B.
|McCluskey, Lawrence A.
|Schulman, Robert S.
|Wolfle, Lee M.
|Date of Defense
The purpose of the study was to compare the effects on item bias
of conventional testing procedures to the effects of two-stage testing
procedures. It is conjectured that much of the measurement error identified
as bias can be explained by factors~ such as guessing or carelessness,
attributable to inappropriate matching of test difficulty
level and examinee ability level.
Methods for detecting bias based on the-traditional definition
of item difficulty fail to separate test characteristics from the
ability distribution of the respondent sample. The separation of
item and ability parameters, however, is an essential ingredient for
an objective definition of bias. Such objectivity in measurement is
provided by the Rasch latent trait model, which consequently was
selected as the basis for this study. Three definitions of bias were
considered, two of which were based on the Rasch model.
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