College teachers in the sciences and professional studies have endorsed collaborative learning group strategies for teaching undergraduate statistics courses, but few researchers provide empirical evidence that students' quantitative skills actually increase as a result of the collaborative experience. Assessment of the efficacy of collaborative…

We discuss the evidence on the effectiveness of preschool programs using results from three well-known intervention studies: the Chicago Child-Parent Centers, High/Scope Perry Preschool Program, and the Carolina Abecedarian Project. Results from cost-benefit analyses of other programs for younger and older children also are reported. Given that…

Steven Ross's (2005) recent paper empirically measuring the efficacy of formative assessment compared to the summative variety found that the former produced positive effects on some aspects of language learning. In this critique, it is contended that Ross's study is flawed because his two groups of learners, one receiving summative assessment and…

THE RESULTS OF THIS STUDY CLEARLY INDICATE THE INADVISABILITY OF ATTEMPTING TO PERFORM ITEM ANALYSES BASED UPON SMALL SAMPLES. THE SINGLE ITEM DISCRIMINATION INDEX BASED UPON SAMPLES OF SIZE 15, 30, OR 60, HAS LITTLE OR NO VALUE. THOSE BASED UPON SAMPLES OF 120 ARE ONLY INDICATIVE IN NATURE. (LP)

This study was concerned with the identification of the job dimension underlying the job elements of the Position Analysis Questionnaire (PAQ), Form B. The PAQ is a structured job analysis instrument consisting of 187 worker-oriented job elements which are divided into six a priori major divisions. The statistical procedure of principal components…

An index that reflects the accuracy of selection associated with a predictive validity of "r" is presented. Based on Sheppard's thoerem on median dichotomies, it is a measure of improvement over chance assignment to "accept" (or "reject"). Because the index is a measure of the accuracy of this assignment, rather than…

The consistently high suicide rates of older White males provide a strong rationale for increased study of the geriatric suicide problem. Data related to White males aged 60 and older who killed themselves in Arizona during 1970 through 1975 are presented. (Author)

In some linear regression problems samples may be unwittingly drawn from a heterogeneous population. The exploratory procedure described in this paper can be used to detect heterogeneity in a regression problem associated with the intercept. (Author)

The judged accuracy of narrative paragraph types and total reports of a new Minnesota Multiphasic Personality Inventory (MMPI) clinical interpretation simulation program is studied. A linear regression analysis of variance of overall narrative ratings with two narrative and four patient variables suggest that this system has considerable…

In discussion about search keys, concern has been expressed as to how the number of items retrieved by a single value relates to collection size. This paper creates a statistical model that attempts to give some insight into this behavior. (6 references) (Author)

Attempts to ascertain to what degree structural factors might explain variance in the work-value systems of white collar workers. (Author)