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Browsing by Author "Green, Bert F."

Now showing 1 - 2 of 2
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    Adaptive estimation when the unidimensionality assumption of IRT is violated
    (1989) Folk, Valerie G.; Green, Bert F.
    This study examined some effects of using a unidimensional IRT model when the assumption of unidimensionality was violated. Adaptive and nonadaptive tests were formed from two-dimensional item sets. The tests were administered to simulated examinee populations with different correlations of the two underlying abilities. Scores from the adaptive tests tended to be related to one or the other ability rather than to a composite. Similar but less disparate results were obtained with IRT scoring of nonadaptive tests, whereas the conventional standardized number-correct score was equally related to both abilities. Differences in item selection from the adaptive administration and in item parameter estimation were also examined and related to differences in ability estimation. Index terms: ability estimation, adaptive testing, item parameter estimation, item response theory, multidimensionality.
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    Equivalence of conventional and computer presentation of speed tests
    (1986) Greaud, Valerie A.; Green, Bert F.
    This study examined the effects of computer presentation on speeded clerical tests. Two ratio scores-average number of correct responses per minute and its inverse, average number of seconds per correct response-were examined as variants of the conventional score, number of correct responses in a fixed interval of time. Ratio scores were more reliable than number-correct scores and were less sensitive to testing time. Tests administered on the computer were found to be at least as reliable as conventionally administered tests, but examinees were much faster in the computer mode. Correlations between paper-and-pencil and computer modes were high, except when task differences were introduced by computer implementation.