Another power calculation of sorts.
I have calculated an ICC 0f 0.886
When trying to calculate the power of this study I need to know
R0 (null hypotheis) and R1 (perfect hypothesis)
Is the null hypothesis that there is NO correlation and therefore R0=0 and my alternative hypothesis is 0.886 that i calculated above?
There are a few worked examples on the web but they have R0=0.2
How would you be able to estimate a precise fugure for a null hypothesis?