Description
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).