statpsych - Statistical Methods for Psychologists
Implements confidence interval and sample size methods
that are especially useful in psychological research but are
also useful in educational, social science, business, and
biological research. This package includes more than 100
confidence interval functions and more than 80 sample size
functions for 1-group, 2-group, paired-samples, and
multiple-group designs and for a variety of parameters
including means, medians, proportions, slopes, standardized
mean differences, standardized linear contrasts of means, and
several measures of correlation and association. The sample
size functions can be used to approximate the sample size
needed to estimate a parameter or function of parameters with
desired confidence interval precision or to perform a variety
of hypothesis tests (directional two-sided, equivalence,
superiority, noninferiority) with desired power. For details
about these methods see: Statistical Methods for Psychologists,
Volumes 1 – 4, <https://dgbonett.sites.ucsc.edu/>.
