statpsych - Statistical Methods for Psychologists
Implements confidence interval and sample size methods
that are especially useful in psychological research, but are
also useful in business, social science, and biological
research. The methods can be applied in 1-group, 2-group,
paired-samples, and multiple-group designs and to a variety of
parameters including means, medians, proportions, slopes,
standardized mean differences, standardized linear contrasts of
means, plus several measures of correlation and association.
Confidence interval and sample size functions are given for
single parameters as well as differences, ratios, and linear
contrasts of parameters. 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 see:
Statistical Methods for Psychologists, Volumes 1 – 4,
<https://dgbonett.sites.ucsc.edu/>.
