Dear Statalisters
I have a pooled cross sectional dataset, with some
variables not available for all years. When I run an
oprobit I get some year dummies dropped due to
collinearity.
First, does anyone know why this occurs and second is
how to avoid this occuring if this is possible.
If you need further clarification please let me know.
Thanks in advance
____________________________________________________________
Yahoo! Messenger - Communicate instantly..."Ping"
your friends today! Download Messenger Now
http://uk.messenger.yahoo.com/download/index.html
*
* 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/
