A novel use of periodic functions, called the periodic procedure, was recently introduced to make practical the use of certain physical measurement ideas in psychology. This paper reports a successful attempt to apply the periodic procedure to an important psychological measurement problem, the measurement of aptitude test item difficulties. The…

Bounds are obtained for a coefficient proposed by Kaiser as a measure of average correlation and the coefficient is given an interpretation in the context of reliability theory. It is suggested that the root-mean-square intercorrelation may be a more appropriate measure of degree of relationships among a group of variables. (Author)

Randomization should be employed whenever possible but the use of carefully controlled nonrandomized data to estimate causal effects is a reasonable and necessary procedure in many cases. (Author/BJG)

THIS STUDY WAS CONDUCTED TO (1) DETERMINE WHETHER DIFFERENCES IN TYPING TEST LENGTH, CONTENT, FORMAT, AND TIME LIMIT HAVE ANY EFFECT ON TEST SCORES, AND (2) COMPARE THE RELIABILITY OF 5-MINUTE TYPING TESTS WITH THAT OF 10-MINUTE TESTS. TWO EQUIVALENT FORMS OF THE U.S. EMPLOYMENT SERVICE TYPING TEST AND ONE FORM OF THE U.S. CIVIL SERVICE COMMISSION…

A MEASURING OPERATION IS A SAMPLE FROM A UNIVERSE OF ADMISSIBLE OBSERVATIONS....GENERALIZABILITY STUDIES ESTIMATE THE MAGNITUDE OF THE DISCREPENCIES LIKELY TO ARISE UNDER A GIVEN MEASURING PROCEDURE, AND PROVIDE FORMULAS FOR ESTABLISHING INTERVAL AND POINT ESTIMATES OF THE UNIVERSE SCORE. A MULTIFACET GENERALIZABILITY ANALYSIS DEPARTS IN SEVERAL…

The development of perceptual-motor integration is an important area of study for the educational psychologist. This capacity is intimately or closely related to the development of reading and writing skills in children. This study reports a preliminary investigation of the reliability of one current test of this capacity, the Minnesota…

An overview of generalizability theory and a FORTRAN computer program for studying the generalizability of scores in a three facet, four factor design are presented. An illustrative example is presented. (Author/JKS)

In this brief note, the author argues against the use of squared correlation coefficients as measures of explained variance. (JKS)

An efficient algorithm for maximizing split-half reliability coefficients is described. Coefficients derived by the algorithm were found to be generally larger than odd-even split-half coefficients or other internal consistency measures and nearly as large as the largest split half coefficients. MSPLIT, Odd-Even, and Kuder-Richardson-20…

Shoemaker's conclusions related to the influence of various data base characteristics (reliability, variability of item difficulty indices, and degree of skewness in the normative distribution) on the standard error of a mean estimated via multiple matrix sampling procedures are examined. (Author/RC)

Multivalent relations, inferred as relationships with an added dimension of discernment, are realized as weighted graphs with multivalued edges. A unified treatment of the threshold problem is discussed and a reliability measure is produced to judge various partitions. (Author/EM)