compute_smd_var: Computes SMD variance
Description
Calculates the variance of a standardized mean difference using the method of
Hedges and Olkin (1985):
Usage
compute_smd_var(d, smd_parts)
Arguments
- d
an SMD value
- smd_parts
a list
of components for from compute_smd_parts
computing standardized mean differences
Details
$$
\sqrt{\frac{n_1 + n_2}{n_1n_2} + \frac{d^2}{2(n_1 + n_2)}}
$$