Description Usage Arguments Value References Examples
Compute the required per-group sample size for the LANCOVA test.
1 | ss.lancova(k, rho_sqrd, r_sqrd, power = 0.8, alpha = 0.05)
|
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) |
n |
the per-group sample size requirement |
Cohen, J. (1988). Statistical power analysis for the behavioral sciences (2nd ed.). Hillsdale,NJ: Lawrence Erlbaum.
1 | ss.lancova(3,.5,.01,.14,.05)
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