In 1881, Donald MacAlister posed a problem in the "Educational Times" that remains relevant today. The problem centers on the statistical evidence for the effectiveness of a treatment based on a comparison between two proportions. A brief historical sketch is followed by a discussion of two default Bayesian solutions, one based on a…

The procedures required to obtain the approximate posterior standard deviations of the parameters in the three commonly used item response models for dichotomous items are described and used to generate values for some common situations. The results were compared with those obtained from maximum likelihood estimation. It is shown that the use of…

The superior program proved to be suprogram PROB published by the National Bureau of Standards. (Author)

Results suggest that for most colleges in this sample the ACT tests were at least as efficient predictors of college overall GPA as were the SAT tests. (Authors)

Study was undertaken to determine the degree to which the EPPS, CPI, and 16 PF scales are correlated with the EPI scales and to determine the degree to which the scales in all four inventories are measuring the same common traits. (Authors)

The authors previously discussed the importance of effect size and Type II errors as factors in determining sample size. Tables were developed and presented for one-factor designs with k levels. As these tables could not be used for the one sample case, comparable tables were developed and are presented. (Author/DWH)

Focusing on linear interpolation, an accurate method of implementing parallel analysis, this article contains tables of 95th percentile eigenvalues from random data than can be used with sample sizes of 50 to 500 subjects and between 5 and 50 variables. An empirical example illustrates how to obtain the eigenvalues. (SLD)

The SIT Correlates highly enough with ACT scores to be considered a valid instrument for predicting acceptance and success in college. (Authors)

Purpose of this study is to determine the relative value of three item validation methods which may be employed in the selection of items for inclusion in a test. (Author/CB)

Quick power estimates for detecting a difference in two population proportions are expedient during early stages of research planning. Such estimates are tabled and graphed in this article. They are shown to be conservative but accurate for most research situations when proportions fall in the range of 0.25 to 0.75. (SLD)

Tremendous discrepancies between student and parent perceptions of the environment suggest that even though parents may have a reporter on the scene," their perceptions are still not congruent with those of students. (Author)

The ideal item in the criterion-referenced testing situation is the item with a nonsignificant discrimination index and a high difficulty level; items that discriminate negatively are clearly unacceptable; and items that discriminate positively usually indicate a need for revision. (Author)

Paper compares a set of multi-item personality scales with a set of comparable example-anchored scales. (Authors/MB)

Factors seem to indicate that the OQS could be effectively substituted for the NTE as a screening measure for graduate students in education. The D-48 was not added to the prediction equation, since it made a negligible contribution to the total prediction. (Authors/CB)