You may override this value.">Effect Size:
Calculates the sample size basted on the number of predictors and draw a power analysis chart. Use this test for one of the following tests:
Simple Linear Regression
Multiple Linear Regression
One Way ANOVA
|f2 =||R2||, R2 =||f2|
|1 - R2||1 + f2|
Linear regression with 4 predictors, α=0.05, power=0.8.
A sample of 85 will identify model with R2=0.13. (or f=0.3873 or f2=0.15)
i.e. the power of a model with a smaller R2 will be lower than 0.8 .
The following R code should produce the same results