st: power analysis/sample size for random effects model

[jgustin@usd.edu]

I am currently planning a study that will use a random effects regression model (xtreg) and would like to know how to determine the needed sample size based on number of predictors and expected effect sizes.
Thank you.

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/