README.md
In pwrss: Statistical Power and Sample Size Calculation Tools

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::: {} To install, load, and use pwrss in R: install.packages("pwrss") library(pwrss)

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::: {} Alternatively calculations can be performed using links below:

| Language | User Interface | |:----------|:---------------| | English | https://pwrss.shinyapps.io/index/ | | English | https://pwrss.shinyapps.io/lang-en/ | | Turkish | https://pwrss.shinyapps.io/lang-tr/ |

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pwrss R package allows statistical power and minimum required sample size calculations for

(1) testing a proportion (one-sample) against a constant,
(2) testing a mean (one-sample) against a constant,
(3) testing difference between two proportions (independent samples),
(4) testing difference between two means/groups (parametric and non-parametric tests for independent and paired samples),
(5) testing a correlation (one-sample) against a constant,
(6) testing difference between two correlations (independent samples),
(7) testing a coefficient (with standardized or unstandardized coefficients, with no covariates or covariate adjusted) in multiple linear regression, logistic regression, and Poisson regression,
(8) testing an indirect effect (with standardized or unstandardized coefficients, with no covariates or covariate adjusted) in the mediation analysis (Sobel, Joint, and Monte Carlo),
(9) testing an R-squared against zero in linear regression
(10) testing an R-squared difference against zero in hierarchical regression
(11) testing an eta-squared or f-squared (for main and interaction effects) against zero in analysis of variance (ANOVA) (could be one-way, two-way, and three-way),
(12) testing an eta-squared or f-squared (for main and interaction effects) against zero in analysis of covariance (ANCOVA) (could be one-way, two-way, and three-way),
(13) testing an eta-squared or f-squared (for between, within, and interaction effects) against zero in one-way repeated measures analysis of variance (RM-ANOVA) (with non-sphericity correction and repeated measures correlation),
(14) testing goodness-of-fit or independence for contingency tables. Alternative hypothesis can be formulated as "not equal", "less", "greater", "non-inferior", "superior", or "equivalent" in (1), (2), (3), and (4); as "not equal", "less", or "greater" in (5), (6), (7) and (8); but always as "greater" in (9), (10), (11), (12), (13) and (14).

If you find the package and related material useful please cite as:

Bulus, M. (2023). pwrss: Statistical Power and Sample Size Calculation Tools. R package version 0.3.1. https://CRAN.R-project.org/package=pwrss
Bulus, M., & Polat, C. (in press). pwrss R paketi ile istatistiksel guc analizi [Statistical power analysis with pwrss R package]. Ahi Evran Universitesi Kirsehir Egitim Fakultesi Dergisi. https://osf.io/ua5fc/download/