(This article was first published on R Psychologist - R, and kindly contributed to R-bloggers)
My R package powerlmm 0.3.0 is now out on CRAN. It can be installed from CRAN https://cran.r-project.org/package=powerlmm or GitHub https://github.com/rpsychologist/powerlmm.
New features
This version adds support for raw effect sizes, and new standardized effect sizes using the function cohend(...). Here’s an example that use the different types.
p <- study_parameters(n1 =11, n2 =25, icc_pre_subject =0.5, var_ratio =0.03, effect_size =c(10,# raw cohend(0.5, standardizer ="pretest_SD"), cohend(0.5, standardizer ="posttest_SD"), cohend(0.5, standardizer ="slope_SD")))
Other changes
- Support for lmerTest 3.0.
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