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| From | ARDE DE <wsbbarde@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | st: Missing data in panel analysis |
| Date | Thu, 7 Mar 2013 18:21:06 +0100 |
Dear All: In my panel analysis I have the following problem with missings: Assume that all individuals are observed throughout all time periods t_1, t_2, ..., t_T, for a certain set of variables. But a new variable is added at t_2 (and being answered for t_2, t_3, ..., by all individuals). Assume that this new variable did not make sense in t_1 (e.g. do you have an iphone asked in 1987...) So, this variable is missing only for t_1. How can I deal with that problem? On the one hand I have missings in my matrix of regressors and cannot perform the usual inversions etc. On the other hand, it would be inefficient to drop the entire new variable. Any hints are highly appreciated. Kind regards Arde * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/