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From |
Christian Weiß <C.Weiss@plusser-portal.de> |

To |
"statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |

Subject |
st: xtmixed - "Missing Values Encoutered" |

Date |
Mon, 23 Jun 2008 14:49:27 +0200 |

Hello! I am currently trying to "bug fix" a mixed model which unfortunately did not converge. Having eliminated some relatively highly correlated variables the following message was displayed : could not calculate numerical derivatives missing values encountered (complete output see below) What is ment by "missing values" in this case? Do you have an suggestion how to tackle this particular problem? Thank you very much in advance! Best regards, Christian Performing EM optimization: Performing gradient-based optimization: Iteration 0: log restricted-likelihood = -8380.4495 (not concave) numerical derivatives are approximate flat or discontinuous region encountered Iteration 1: log restricted-likelihood = -8380.1053 (not concave) numerical derivatives are approximate flat or discontinuous region encountered Iteration 2: log restricted-likelihood = -8380.1053 (not concave) numerical derivatives are approximate flat or discontinuous region encountered Iteration 3: log restricted-likelihood = -8379.8833 (not concave) numerical derivatives are approximate flat or discontinuous region encountered Iteration 4: log restricted-likelihood = -8379.8833 (not concave) numerical derivatives are approximate flat or discontinuous region encountered Iteration 5: log restricted-likelihood = -8379.7179 (not concave) numerical derivatives are approximate flat or discontinuous region encountered Iteration 6: log restricted-likelihood = -8379.5492 (not concave) numerical derivatives are approximate flat or discontinuous region encountered Iteration 7: log restricted-likelihood = -8379.5402 (not concave) numerical derivatives are approximate flat or discontinuous region encountered Iteration 8: log restricted-likelihood = -8379.5392 (not concave) numerical derivatives are approximate flat or discontinuous region encountered Iteration 9: log restricted-likelihood = -8379.5178 (not concave) numerical derivatives are approximate flat or discontinuous region encountered Iteration 10: log restricted-likelihood = -8379.5178 (not concave) numerical derivatives are approximate flat or discontinuous region encountered Iteration 11: log restricted-likelihood = -8379.4144 (not concave) numerical derivatives are approximate flat or discontinuous region encountered Iteration 12: log restricted-likelihood = -8379.4144 (not concave) numerical derivatives are approximate flat or discontinuous region encountered Iteration 13: log restricted-likelihood = -8379.3935 (not concave) numerical derivatives are approximate nearby values are missing Iteration 14: log restricted-likelihood = -8379.3908 (not concave) numerical derivatives are approximate nearby values are missing Iteration 15: log restricted-likelihood = -8379.3895 (not concave) numerical derivatives are approximate nearby values are missing Iteration 16: log restricted-likelihood = -8379.389 (not concave) numerical derivatives are approximate nearby values are missing Iteration 17: log restricted-likelihood = -8379.389 (not concave) could not calculate numerical derivatives missing values encountered Mixed-effects REML regression Number of obs = 1829 ----------------------------------------------------------- | No. of Observations per Group Group Variable | Groups Minimum Average Maximum ----------------+------------------------------------------ _all | 1 1829 1829.0 1829 country | 11 82 166.3 265 prima~1digit | 88 1 20.8 142 ----------------------------------------------------------- Wald chi2(0) = . Log restricted-likelihood = -8380.4495 Prob > chi2 = . ------------------------------------------------------------------------------ bh5 | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- _cons | 41.70724 8.873858 4.70 0.000 24.31479 59.09968 ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ Random-effects Parameters | Estimate Std. Err. [95% Conf. Interval] -----------------------------+------------------------------------------------ _all: Independent | sd(beta) | 9.273805 . . . sd(logtot~g) | 2.883647 . . . sd(indust~n) | 1.348894 . . . sd(divers~n) | .88744 . . . sd(netinc~r) | .001017 . . . sd(countr~n) | .0195022 . . . sd(uai) | .4257892 . . . sd(stockm~v) | .0993575 . . . sd(_cons) | 1.443472 . . . -----------------------------+------------------------------------------------ country: Identity | sd(_cons) | 7.083008 . . . -----------------------------+------------------------------------------------ prima~1digit: Identity | sd(_cons) | 4.61776 . . . -----------------------------+------------------------------------------------ sd(Residual) | 23.14977 . . . ------------------------------------------------------------------------------ LR test vs. linear regression: chi2(11) = 533.23 Prob > chi2 = 0.0000 Note: LR test is conservative and provided only for reference. Warning: convergence not achieved; estimates are based on iterated EM * * 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/

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