New Software for Ed & Psych Associates

A standalone Macintosh program that applies the Spearman-Brown'prophecy formula to calculate the reliability of a test if items are added or deleted.Requirements:OS X 10.2 or...

A standalone Macintosh program that calculates the probability of z, t, F, and chi-square values.Requirements:Mac OS X 10.4 or...

Calculates standardized effect sizes (Cohen's d, r, Glass's delta, Common Language Effect Size, etc.) given appropriate means and standard deviations.Requirements:Mac OS X 10.2 or higher (Universal...

Estimates the sample size needed for a specified coefficient alpha, given the Type I error rate and the effect size.Requirements:Mac OS X 10.2 or...

A standalone Macintosh program that converts raw scores to standard scores and converts between standard scores, including z, T, deviation IQ, NCE, percentile, etc.Requirements:Mac OS X 10.2 or...

Calculates positive predictive power, given prevalence and test results.Requirements:Mac OS X 10.2 or higher (Universal...

A standalone Macintosh program that quantifies the visual scree test to determine the number of factors to retain in exploratory factor analysis using the method described by Zoski and Jurs (1996) in Educational and Psychological...

A standalone Macintosh program that calculates independent and dependent t-tests from group data (means, standard deviations, etc.).What is new in this release:Universal. Uneven N allowed.Requirements:Mac OS X 10.2 or...

Computes the reliability of difference scores, given the reliability of two tests and the correlation between those two tests. The reliability of difference scores is a factor of (a) the correlation of the two tests used to calculate the difference score,...

A standalone Windows program that graphs the Receiver Operating Characteristic (ROC) curve and calculates the Area Under the Curve (AUC) using the nonparametric method presented by Hanley and McNeil (1982) that does not make any distributional assumptions...