This package contains several functions that will convert a variety of
statistics, such as a t-test or p-value and sample size, to effect sizes
of d (mean difference), g (unbiased estimate of d), r (correlation
coefficient), z (Fisher's z), and log odds ratio. The variances of these
estimates are also computed. These conversion functions are a particularly
useful resource during the preliminary stages of a meta-analytic project,
when coding for relevant effect size data (and the appropriate statistic
is not reported). This package uses recommended coversion formulas as
described in The Handbook of Research Synthesis and Meta-Analysis (Cooper,
Hedges, & Valentine,
2009).