Download PDF by Inc. BarCharts: BarCharts QuickStudy Introduction to Health Care

By Inc. BarCharts

Comprehensive advisor on what to anticipate while getting ready for a scientific career.

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In case true scores (and observed scores) on test Y are uncorrelated with those on X, the formula can be simplified to the Kelley formula. 8). In case true scores on subtests X and Y are strongly correlated and subtest X is relatively unreliable, it is possible to have a smaller weight for X than for Y in the formula for the prediction of the true score on X. 15) In other words, the optimal prediction formula for predicting the true score on X given observed scores on X and Y can be viewed as a two-step process.

That is to say, some form of parallelism is required of the supplemented parts with the initial test. Adding a less-discriminating item might lower test reliability. For (partly) speeded tests, adding items to boost reliability has its specific problems. Lengthening a partly speeded multiple-choice test might also result in a lower reliability (Attali, 2005). 5 Reliability and group homogeneity A reliability coefficient depends also on the variation of the true scores among subjects. So, the homogeneity of the group of subjects is an important characteristic to consider in the context of reliability.

Further, if we do not have a parallel test, we must find another way to estimate reliability. 1 On parallelism and other types of equivalence To be sure, a certain test may have different sets of parallel tests (Guttman, 1953). Does it matter, for all practical purposes, if a test has different sets of parallel forms? An investigator will always look for meaningfulness and interpretability of the measurement results. fm Page 19 Friday, June 29, 2007 9:37 PM CLASSICAL TEST THEORY AND RELIABILITY 19 forms do not suit the purpose of an investigator using a specific test, this investigator might well choose the most appropriate form of parallel test.

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