| se.biphi {vcmeta} | R Documentation |
Computes the standard error for a biserial-phi correlation
Description
This function can be used to compute an estimate of a biserial-phi correlation and its standard error using the frequency counts from a 2 x 2 contingency table where one variable is naturally dichotomous and the other variable is artifically dichotomous. A biserial-phi correlation could be compatible with a point-biserial correlation in a meta-analysis. The biserial-phi estimate and the standard error from this function can be used as input in the meta.ave.gen function in a meta-analysis where a point-biserial correlation has been obtained in some studies and a biserial-phi correlation has been obtained in other studies.
Usage
se.biphi(f1, f2, n1, n2)
Arguments
f1 |
number of participants in group 1 who have the attribute |
f2 |
number of participants in group 2 who have the attribute |
n1 |
sample size for group 1 |
n2 |
sample size for group 2 |
Value
Returns a 1-row matrix. The columns are:
Estimate - estimated biserial-phi correlation
SE - standard error
Examples
se.biphi(34, 22, 50, 50)
# Should return:
# Estimate SE
# Biserial-phi: 0.27539 0.1074594