ABC of psychological medicine by Richard Mayou; Michael Sharpe; Alan Carson

By Richard Mayou; Michael Sharpe; Alan Carson

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The task is to detect the number of errors in the copy and to report that answer on the second screen when ready. Subjects proceed at their own pace. Latencies are recordedforthe &stscreen (solution time) andthesecondscreen (verification time), andtotal trial time. Each latency in milliseconds is converted toa logarithm. Because the items are presented to the subjects in incomplete blocks, with a design for ensuring complete sampling of item types and processes in 56 items (11 blocks of 5 and one extra at random), it is instructive to regress the log latencies for each item in its block of five against the final adjusted score.

There are a t least three measurement paradigms that qualify how item generation has developed in the past and may yet grow in future. 'l'hese have been described in detail elsewhere (Irvine, Dann, & Evans, 1987; Irvine, Dann, Evans, Dennis, Cohs, Thacker, & Anderson, 1989) as R (Accuracy), L (Latency), and D (Dynamic or Change) Models. In the interests of brevity and clarity, their influence on test construction methods is summarized R-Models. Those who favor accuracy or R-Models mark items as right and wrong and may use classical test theory in which true score variance and error variance are the two determinants of reliabhty-a notion that began with Spearman.

Moreover, in the Number Distance test an item order effectwas observed. The later items were done more slowly on both occasions. Because the Alphabet Forward and Backward Test had been singled out by Kyllonen and Christal (1990) as a robust marker for worhng memory efficiency, detailed analyses of the results of this test were carried out using Days 1, 5 , and 10 of each time period, immedlate postoperative and 19 weeks later. From work by Woltz (1987), the number of letters encoded, thenumber of steps involved, and whetherthe steps were forward or backward in the alphabet, were assumed to affect between subject p value consistently.

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