Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, statalist.org is already up and running.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Mekbib Haile <email@example.com>
Fri, 24 Aug 2012 04:30:41 -0700 (PDT)
I have 2 questions:
1. After a sureg command on STATA using price levels, I wanted to estimate elasticities with the margins* command.
I have one problem with one of my equations: stata gives me the following error message.
. margins, eyex (l2.y l.y x1 x2 x3) predict(equation(y))
could not calculate numerical derivatives -- discontinuous region with missing values encountered r(459);
However, my data has no missing values except for the lag variables. What could be a potential problem? The same command works fine when all the covariates were in logarthmic format.
Do you also suggest estimating elasticities at mean (atmeans option) values or better to use the average of the elasticities of individual observations?
2. How do I test and control for Heteroscedasticity after a Seemingly Unrelated Regression using STATA?
* For searches and help try: