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- W70567904 abstract "UnifyPow is a freeware SAS ® module/macro that performs statistical power analysis and other matters related to sample-size choice. Its functionality covers an extensive set of methods. One-group tests include the t and Wilcoxon for H 0 : μ = μ 0 ; the binomial and Z approximation for H 0 : π = π 0 ; t and Wilcoxon for paired means; McNemar's for paired proportions; and Fishers's r-to-Z for H 0 : ρ = ρ 0 . Two-group tests include t and Wilcoxon-Mann-Whitney for H 0 : μ 1 ‐ μ 2 = δ 0 ; χ 2 , likelihood ratio (LR), and Fisher's exact for H 0 : π 1 = π 2 (association in 2 〈 2 tables); r-to-Z for H 0 : ρ 1 = ρ 2 . Jgroup tests include ANOVA via the cell-means model with general linear contrasts; χ 2 and LR tests for proportions (2 〈 J tables) with general linear contrasts on J logits. Also covered are the test of H 0 : β j = β j0 in a multiple regression model predicting Y from q X’s (“Y | q X’s”) in which X j has tolerance Tol(X j ) = 1 ‐ R 2 (X j | other q ‐ 1 X’s); the comparison of R 2 (Y | q full X’s) versus R 2 (Y | q reduced X’s) from nested linear models; and G 2 or ‐2lnL from full vs. reduced logistic, log-linear, or Cox survival models. All methods handle unequal n designs. Any set of alpha-levels may be specified and results for directional (one-tailed) tests are given when potentially appropriate. Tabular output is well developed and graphical output is possible. A simple syntax unifies concepts and specifications across methods. For the current status of this ongoing project and information on downloading, see http://www.bio.ri.ccf.org/power.html" @default.
- W70567904 created "2016-06-24" @default.
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- W70567904 date "1998-01-01" @default.
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- W70567904 title "A Tour of UnifyPow: A SAS Module/Macro for Sample-Size Analysis" @default.
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