Thank you very much for the immediate reply!
I will download the package ASAP!
Theodoros
-----------------------------------------------
You might use my -powercal- package, downloadable from
SSC, to
calculate
power and sample size curves for your parameter of
primary interest,
using your small dataset as a pilot study. Newson
(2004) explains how
you can do this. The final example (Examople 3) gives
a demonstration
of
how this can be done even for rank statistics, and it
should certainly
be feasible for -xtreg-type models.
I hope this helps.
Best wishes
Roger
References
Newson R. Generalized power calculations for
generalized linear models
and more. The Stata Journal 2004; 4(4): 379-401. Also
downloadable from
Roger Newson's website at
http://www.kcl-phs.org.uk/rogernewson/
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