I accidently omitted the subject line in an earlier email and am sending the message again, so I apologize if this is posted twice.
Is there a user-written program appropriate for the type of truncated data discussed in Maddala (1983, p.165-170): "Limited-Dependent and Qualitative Variables in Econometrics"?
The book is viewable at:
http://books.google.com/books?hl=en&lr=&id=-Ji1ZaUg7gcC&oi=fnd&pg=PR11&dq=Maddala+(1983)+limited+dependent+and+quali&ots=7d2o6EjTJM&sig=77sA4nJ7g5xQ6kzZMJHAkVjIVMI#PPA170,M1
I have data on contract duration for contracts observed in 2006 but signed at earlier dates. This means that I observe some contracts with a duration of ten years, but I do not observe a contract signed in the same year with a duration of 3 years (that is, it was binding for only 3 years). OLS estimates are therefore biased, and MLE is needed.
Jason
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
