statpsych - Statistical Methods for Psychologists
Implements confidence interval and sample size methods
that are especially useful in psychological 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. The confidence
intervals and sample size functions are applicable to 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/>.
