Sample size estimation for difference-in-difference design with continuous outcome

[Michael Michaela]

Dear all,

I have spent some time looking for possibilities to estimate the required sample size for a difference-in-difference design with continuous outcome. Is there a procedure in Stata 15? Or is there a package available in another program that I have overlooked? Thanks a lot for your guidance on this matter in advance.

Best

Michael

[Jared Greathouse]

I don't understand the problem.

What exactly are you studying

[Rich Goldstein]

based on the limited information you supply, you have a linear regression analysis and want one of the routines offered in the -power- set of commands; see

h power

and look at the "linear regression" section of that help file