NEWS

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pwrss 1.2.0 (2026-06-22)

• Added unit tests for all procedures
  • Added minimum detectable effects
  • Added exact correlation (one sample)
  • Added type S and M errors for two-sided tests, available through plot() function
  • Added clean.parms, unifying how the input parameters in the results list are returned
  • Added further input checks so that all input parameters are checked
  • Simplified code in power.z.logistic and power.z.poisson
  • Corrected formula for Hsieh et al. (1998) in power.z.logistic
  • Added target.effect to determine effect of interest in power.f.ancova

pwrss 1.0.0 (2025-09-16)

• Addition 1: ANCOVA procedures with means and contrasts (Shieh)
  • Addition 2: Exact tests for proportions (Fisher & McNemar)
  • Addition 3: Generic binomial test (with plotting feature)
  • Addition 4: Dependent correlations (Steiger)
  • Addition 5: Effect size conversion functions
  • Extension 1: Generic tests handles non-zero null (useful for equivalence and minimum effect testing). Some specific tests also allow non-zero null.
  • Extension 2: ANCOVA procedures allow R-squared adjustment (i.e., Keppel and Shieh)
  • Consistent function names, population-consistent argument names (Greek notation) and base R consistency
  • Rigorous error checks and warnings
  • Comprehensive print utility with three-tier verbosity control
  • Minor bug fixes to plot() function

pwrss 0.3.2

• alternative = "less" now produce correct power rates in pwrss.z.prop() function. Thanks to Leszek Gawarecki for reporting the issue.
  • The default for p0 argument in pwrss.chisq.gofit() can now be overwritten. Thanks to Kate Crespi for reporting the issue.
  • Type 1 and type 2 error plots show and print correct power estimates for two-tailed tests when effect size is near zero. Thanks to dpnichols811 (GitHub profile handle) and Adrian Olszewski for reporting the issue.
  • pwrss.z.corr() print correct errors with alternative = "greater" when in fact it is less (or vice versa). Thanks to Jarrod Hadfield for reporting the issue.

pwrss 0.3.1 (2023-04-11)

• More detailed vignette (typo fixes)
  • Added web application links (shiny dashboards)
  • Minor bug fixes with plot() function

pwrss 0.3.0 (2023-03-12)

• Added pwrss.np.2means(), pwrss.z.logreg(), pwrss.z.poisreg(), pwrss.chisq.gofit(), and generic power.chisq.test() functions
  • Improvements to plot() function
  • Improvements to documentation
  • Improvements to pwrss.z.med() and pwrss.f.ancova() console print
  • More detailed and comprehensive examples in vignette
  • Bug fixes (Welch’s t test)

pwrss 0.2.0 (2022-12-14)

• Added pwrss.t.reg() and pwrss.z.med() functions

pwrss 0.1.0 (2022-11-09)

• Initial release