The most widely used procedures to harness the power of a concomitant (nuisance) variable are block designs and analysis of covariance (ANCOVA). This study attempted to provide a scientific foundation on which to base decisions on whether to block or covary and how many blocks to be used if blocking is selected. Monte Carlo generated data were…

When test-takers are offered a choice of essay questions, some questions may be harder than others. If the test includes a common portion taken by all test-takers, an adjustment to the scores is possible. Previously proposed adjustment procedures disregard the test-makers' efforts to create questions of equal difficulty; these procedures tend to…

This study investigated the correlation between self-concept and reading achievement level in 20 reading-disabled students (mean age 10.3 years, mean grade level 4.75), having average intelligence. Self-concept was assessed using the Piers-Harris Children's Self-Concept Scale and reading achievement level by the Tennessee Comprehensive Assessment…

A study compared the topics addressed in a professional trade publication, the RTNDA (Radio and Television News Directors Association) "Communicator," with topics specifically addressing broadcast news in the scholarly journals "Journalism Quarterly" and "Journal of Broadcasting and Electronic Media." The purpose of…

How the susceptibility perceptions of diverse health risks are reflected in a variety of commonly used likelihood scales (dichotomous, 5-point, 7-point, 9-point, 11-point, and 100-point scales) was examined. Undergraduates (N=103) were asked to rank 12 health risks in the order of likelihood that each problem would happen to them (direct ranking).…

A study examined the relative contributions of age, sex, and education to verbal and nonverbal fluency in a normal population. Sixty-seven subjects aged 12 to 71 years performed paper-and-pencil tasks proven to be dependent on the right and left hemispheric modalities of the frontal lobes. Multiple t-tests were applied to determine whether…

Statistical invariance procedures provide a way of looking at the generalizability of research results from sample to sample when the research has not been validated by replication. This paper discusses the Procrustean Rotation invariance procedure following a canonical correlation analysis. The computer program RELATE is used to gauge the…

In order to determine if the pH of archival storage boxes decreases over time, experimental research was performed by sampling 25 Hollinger, one cubic foot, archival storage boxes from the Kent State University (Ohio) Archives. Boxes chosen for testing were new, 5, 10, 15, and 20 years old. Each box was tested for pH value using pH pens and a cold…

The AGS Early Screening Profiles (AGS:ESP) instrument (P. Harrison, 1990) has been introduced recently as a screening instrument for predicting mental ability. A study was conducted to determine the degree of concurrent validity between the AGS:ESP and the Stanford Binet Fourth Edition (SB:FE), an instrument often used by psychologists to detect…

The 1990 National Household Survey on Drug Abuse is the 10th study in a series of national surveys to measure the prevalence of drug use among the American household population aged 12 and over. This report, which presents estimates of drug use prevalence for the civilian and noninstitutionalized population of the United States, is intended as a…

The two reports contained in this document are products of the 1988 National Household Survey on Drug Abuse, the ninth in a series of national surveys designed to measure the prevalence of drug use among the American household population aged 12 and over. The Main Findings report provides details of the National Household Survey methodology as…

It has been increasingly realized that (1) multivariate methods are essential in most quantitative studies (Fish, 1988; Thompson, 1992), and (2) all conventional parametric analytic methods are correlational and invoke least squares weights (e.g., the beta weights in regression) (Knapp, 1978; Thompson, 1991). The present paper reviews one very…

A study investigated the correlation between students' learning styles and their academic achievement on report cards and standardized tests. Subjects were 58 fifth-grade students in a suburban middle school. The "Learning Style Inventory" by Brown and Cooper was administered to this population, and students' academic averages and…

Aptitude test scores have been correlated with grades in twenty-six courses and with overall indices of academic performance, based on over 500 students attending a public high school. There is little evidence of differential validity for the major academic subject areas; instead, five tests (English Vocabulary, Graphoria, Silograms, Analytical…

Statistics used to estimate the population correlation ratio were reviewed and evaluated. The sampling distributions of Kelly's and Hays' statistics were studied empirically by computer simulation within the context of a three level one-way fixed effects analysis of variance design. (Author/RC)