Hi, for my current research, I wonder how many participants I need for ANCOVA analysis with 2 covariates. I am currently have 40 participants (20 for each group), I am not sure if it is enough. Thanks
You can use G*Power software to calculate sample size.
G*Power software is effective tool to calculate sample size for many ranges of experiments. Also, you can determine effect size and power of the test, G*Power is free to download and easy to use after reading the manual, the download link:
You can use G*Power software to calculate sample size.
G*Power software is effective tool to calculate sample size for many ranges of experiments. Also, you can determine effect size and power of the test, G*Power is free to download and easy to use after reading the manual, the download link:
Hello all, one possibility is to use function pwr.f2.test() in the R package pwr. Details here: https://cran.r-project.org/web/packages/pwr/vignettes/pwr-vignette.html