ss.lancova: Sample Size Planning for LANCOVA

In QMmmmLiu/lamme: Log-Analytic Methods for Multiplicative Effects

Description

Compute the required per-group sample size for the LANCOVA test.

Usage

ss.lancova(k, rho_sqrd, r_sqrd, power = 0.8, alpha = 0.05)

Arguments

k	the number of groups.
rho_sqrd	the pretest-posttest correlation
r_sqrd	the expected explained variance by the model (on the logged scale)
power	the desired statistical power (default=.8)
alpha	the significance level (default=.05)

Value

n	the per-group sample size requirement

References

Cohen, J. (1988). Statistical power analysis for the behavioral sciences (2nd ed.). Hillsdale,NJ: Lawrence Erlbaum.

Examples

ss.lancova(3,.5,.01,.14,.05)

QMmmmLiu/lamme documentation built on May 31, 2019, 5:19 p.m.