Ordinal measurement is the rank ordering of individuals in a population. For ordinal measurement, the concept of an individual propensity distribution is his or her true score. Estimation of, as well as other aspects of the distribution, are discussed. (Author/JKS)

The usual formulas for the reliability of differences between two test scores are based on the assumption that the error scores are uncorrelated. Formulas are presented for the general case where this assumption is unnecessary. (Author/JKS)

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)

A method to improve personality inventory validity by presenting positively keyed items from a single trait in descending order of endorsement and encouraging subjects to respond in terms of the resulting Guttman scale is presented. Experimental results show increases in reliability and validity. (Author/JKS)

The Personal Attribute Inventory was compared to the Adjective Check List as a measure of self concept on a sample of college students. The Personal Attribute Inventory showed strong correlation to two subscales of the Adjective Check List, and more stability over time. (JKS)

The Slosson Intelligence Test and the Shipley Institute of Living Scale were administered in a test-retest fashion to a sample of undergraduates. Correlations between the instruments were moderate and reliabilities for the instruments were moderate to low. (JKS)

Use of the coefficient of concordance is explained to be a simple technique for estimating reliability in small scale situation and is advocated as a valuable method for physical educators. (GW)

This article presents a non-mathematical introduction to latent trait test models and some of their features. Latent trait models are compared to classical test models. Two promising applications of latent trait models and available computer programs are discussed. (Author/JKS)

This article explains the Rasch model for sample-free item analysis and test-free person measurement. It shows how to estimate model parameters from data and how to evaluate the statistical fit of these estimates to the data. Attention is paid to practical considerations. (Author/JKS)

This paper presents the characteristics, properties and development of the National Reference Scale for reading. This new scale is the result of a reanalysis of the Anchor Test Study data using Rasch model procedures, in an effort to produce equated scores among all reading tests included in that study. (Author/JKS)

Minnesota Multiphasic Personality Inventories (MMPI) of 36 patient suicides were compared with two matching control groups. Female suicides differed significantly from all male groups and from both female control groups. These differentiating patterns emerged from a population of voluntary psychiatric patients and would not necessarily be…

The reliability and validity of the nine scale Social and Prevocational Information Battery for educable mentally retarded individuals was evaluated with four additional samples averaging 82 junior and senior high school pupils. (BB)

Ten psychometric criteria (such as item analysis, concurrent validity, and interexaminer reliability) were used to compare four preschool screening tests: "Comprehensive Identification Process", "Developmental Indicators for the Assessment of Learning--Revised" (Dial--R), "Denver Developmental Screening Test", and…