Is it possible to declare a nested effect as the random component in
xtreg in order to get the correct degrees of freedom when testing the
main effect of the nested factor. Specifically, I have subjects nested
within a condition of an experiment, i.e. each level of factor B
(subjects) occurs with only one level of factor A (length of
experiment). I would like to be able to specify something like i(B|A)
for the random component. Is there some way to do this directly or to
adjust the degrees of freedom?
Thanks.
*
* 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/
