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message: 'To cite package "powertools" in publications use:'
type: software
license: MIT
title: 'powertools: Power and Sample Size Tools'
version: 0.1.2
doi: 10.32614/CRAN.package.powertools
abstract: Power and sample size calculations for a variety of study designs and outcomes.
  Methods include t tests, ANOVA (including tests for interactions, simple effects
  and contrasts), proportions, categorical data (chi-square tests and proportional
  odds), linear, logistic and Poisson regression, alternative and coprimary endpoints,
  power for confidence intervals, correlation coefficient tests, cluster randomized
  trials, individually randomized group treatment trials, multisite trials, treatment-by-covariate
  interaction effects and nonparametric tests of location. Utilities are provided
  for computing various effect sizes. Companion package to the book "Power and Sample
  Size in R", Crespi (2025, ISBN:9781138591622).
authors:
- family-names: Crespi
  given-names: Catherine M.
  email: ccrespi@ucla.edu
- family-names: Liu
  given-names: Zichen
  email: zichenliu@ucla.edu
repository: https://CRAN.R-project.org/package=powertools
repository-code: https://github.com/powerandsamplesize/powertools
url: https://github.com/powerandsamplesize/powertools
date-released: '2024-11-21'
contact:
- family-names: Crespi
  given-names: Catherine M.
  email: ccrespi@ucla.edu