Hi!

I want to do a power analysis for a slope test in my linear regression, the command I have tried to run is:

power oneslope 0, n(10392) power(0.80) sdx(1.1) sdy(1.16) alpha(0.01)

but this does not work and I get the following message: "failure to compute effect size; The power function could not be evaluated at the initial values."

I think I have figured out that my problem is that my sample size is too high (n=10392), this since the command works fine up to n(4300).

Does anyone know why the command does not work with higher sample sizes, or have I misinterpreted n here? In the description is says "n=sample size; required to compute power or effect size"

Best regards, Linda