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| From | Maureen Brinkworth <meb308@mail.harvard.edu> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | st: error message running xtmixed with ml |
| Date | Fri, 1 Apr 2011 12:36:56 -0400 |
Hello, I'm trying to run a multilevel model using xtmixed. I've run the model sucsessfully with the variables I need using the code below: xtmixed s_seft neg_valence pos_valence t_posbiastsrneg t_posbiastsrpos genmatch racematch School1 School2 School3 School4 || t_id: However, when I add the option "mle" or "ml" (see code below) to get the maximum likelihood estimation I receive an unending error (also below) that forces me to exit out of the program -- it won't even let me stop the script. What does this mean? Is there any advice for how to correct what I'm doing wrong? Thank you in advance for your help! Maureen xtmixed s_seft neg_valence pos_valence t_posbiastsrneg t_posbiastsrpos genmatch racematch School1 School2 School3 School4 || t_id:, mle Iteration 0: log likelihood = -464.45172 numerical derivatives are approximate nearby values are missing Iteration 1: log likelihood = -462.89916 numerical derivatives are approximate nearby values are missing Iteration 2: log likelihood = -462.89916 (backed up) numerical derivatives are approximate nearby values are missing Iteration 3: log likelihood = -462.89916 (backed up) numerical derivatives are approximate nearby values are missing Iteration 4: log likelihood = -462.89916 (backed up) numerical derivatives are approximate nearby values are missing Iteration 5: log likelihood = -462.89916 (backed up) numerical derivatives are approximate nearby values are missing Iteration 6: log likelihood = -462.89916 (backed up) numerical derivatives are approximate nearby values are missing Iteration 7: log likelihood = -462.89916 (backed up) numerical derivatives are approximate nearby values are missing Iteration 8: log likelihood = -462.89916 (backed up) numerical derivatives are approximate nearby values are missing Iteration 9: log likelihood = -462.89916 (backed up) numerical derivatives are approximate flat or discontinuous region encountered * * 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/