Use of Tukey's Jackknife in establishing a confidence interval around the population coefficient alpha is explored and the robustness of Feldt's procedure along with ten variants of the Jackknife when the data do not conform to the necessary normality requirements are evaluated. Only two of the variants compared to Feldt's approach. (RC)

This investigation had two major purposes. The first was to explore the use of an inferential technique called Tukey's Jackknife in establishing a confidence interval about cooefficient alpha reliability. The second purpose was to study the robustness of the Feldt and the jackknife procedures when the data fails to satisfy usual normality…

Compared Kennedy and Elder's (1982) Wechsler Intelligence Scale for Children (Revised) regression model with Kaufman's (1976) linear equating model. Both the Kennedy and Elder, and the Kaufman abbreviated forms attained a high degree of association, suggesting that both models are equally effective. (Author/BL)

Discusses problems in using traditional measures of reliability for criterion-referenced tests (CRTs) and describes two approaches to reliability for CRTs: estimates sensitive to all measures of error; and estimates of consistency in test outcome. Compares the two approaches and proposes recommendations for interpretation and use. (Author/LRW)

The purpose of this paper is to prove that one currently recommended method of obtaining the reliability of an instrument defined on a population of aggregate units is invalid. This method randomly splits the aggregate into two halves, correlates the two half unit scores by a Pearson product moment correlation coefficient, and corrects the…

This investigation dealt with the development and evaluation of both a music dictation test (PRM78 Dictation Test) and a sightsinging test (CSS76 Criterion Sightsinging Test). It was hoped that the dictation test could eventually be developed to serve as an adequate replacement for the latter. Thirteen samples participated in this project--7…

Data from 200 college-level tests were used to compare three reliability approximations (two of Saupe and one of Cureton) to Kuder-Richardson Formula 20 (KR20). While the approximations correlated highly (about .9) with the reliability estimate, they tended to be underapproximations. The explanation lies in an apparent bias of Lord's approximation…

Copies of this program may be obtained from the author at the University of Southern California, School of Pharmacy, University Park, Los Angeles 90007. (CB)

When comparing two tests that measure the same trait, separate comparisons should be made at different levels of the trait. A simple, practical, approximate formula is given for doing this. The adequacy of the approximation is illustrated using data comparing seven nationally known sixth-grade reading tests. (Author/RC)

To compare the reliability of performance on recorded dictation tests with performance on live tests, 216 university students who were nearing completion of an intermediate shorthand course and 26 job applicants seeking stenographic positions were divided into 10 groups, with five receiving live dictation and five receiving recorded dictation. The…

Finding and interpreting lower bounds for reliability coefficients for tests with nonhomogenous items has been a problem for psychometricians. This paper presents a mathematical formula for finding the greatest lower bound for such a coefficient. (Author/JKS)

Administered three Wechsler adult intelligence scales to 72 undergraduates and tested the quality of means, variances, and covariances, utilizing subtest scale scores and IQs. Results indicated that the three scales were not parallel. Generally, the subtest scaled scores exhibited less similarity across the three scales than the IQ estimates.…

There is variability in the estimation of an equating transformation because common-item parameters are obtained from responses of samples of examinees. The most commonly used standard error of equating quantifies this source of sampling error, which decreases as the sample size of examinees used to derive the transformation increases. In a…