MAc: tt.ancova_to_d – R documentation

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MAc

tt.ancova_to_d

t-test Value from ANCOVA to Standardized Mean Difference (d)

Description

Converts a t-test value from ANCOVA to a standardized mean difference (d)

Usage

tt.ancova_to_d(t, n.1, n.2, R, q)

Arguments

`t`	t-test value reported in primary study.
`n.1`	Treatment group sample size.
`n.2`	Comparison group sample size.
`R`	Covariate outcome correlation or multiple correlation.
`q`	number of covariates.

Value

`d`	Standardized mean difference (d)
`var_d`	Variance of d

Author(s)

AC Del Re & William T. Hoyt

Maintainer: AC Del Re acdelre@gmail.com

References

Borenstein (2009). Effect sizes for continuous data. In H. Cooper, L. V. Hedges, & J. C. Valentine (Eds.), The handbook of research synthesis and meta analysis (pp. 279-293). New York: Russell Sage Foundation.