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RProphecy  v.2.0

rProphecy uses the Spearman-Brown prophecy formula to calculate the reliability of a test if items are added or deleted.

ProbabilityCalc  v.2.0

ProbabilityCalc calculates the probability of z, t, F, and chi-square values.





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Invariance  v.2.0

Calculates three indices of factorial invariance: the coefficient of congruence, a chi-square goodness of fit test, and Cattell's Salient Variable Similarity Index.

Standard Score Converter  v.2.0

Standard Score Converter converts raw scores to standard scores and converts between standard scores, including z, T, deviation IQ, NCE, percentile, etc.

Bayesian Calculator  v.2.0

Calculates positive predictive power, given prevalence and test results.

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