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From |
watt@fas.harvard.edu |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: clogit missing results |

Date |
Mon, 2 May 2005 14:06:02 -0400 |

Hi, I'm sorry to bother you, but I was wondering whether anyone had ever run into this problem. This is a problem for me both on Stata 7 and Stata 8. I am running a clogit regression where the dependent variable can be 1 multiple times for observations within the same group. When I run a clogit regression against an independent variable which is a characteristic of the choice (and which is the same across different groups), I get the following results: . clogit indicator rgdpch, group(id_number) note: multiple positive outcomes within groups encountered. Iteration 0: log likelihood = -41843.543 Iteration 1: log likelihood = -38224.759 Iteration 2: log likelihood = -37944.648 Iteration 3: log likelihood = -37831.499 Conditional (fixed-effects) logistic regression Number of obs = 264383 LR chi2(1) = . Log likelihood = . Prob > chi2 = . ------------------------------------------------------------------------------ indicator | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- rgdpch | .0000689 . . . . . ------------------------------------------------------------------------------ I also run the clogit regression on the same dataset but with different explanatory variables. These explanatory variables are characteristics not of the choice but of the individual (group). However, I seperate all choices into two groups and interact this individual level variable with dummies for each of these two groups. In addition to getting empty results, now, when I run this regression I get different numbers for the coefficient each time. . clogit indicator s_prod2 w_prod2, group(id_number) note: multiple positive outcomes within groups encountered. Iteration 0: log likelihood = -33021.493 Iteration 1: log likelihood = -31149.417 Iteration 2: log likelihood = -31010.648 Iteration 3: log likelihood = -30996.459 Iteration 4: log likelihood = -30994.814 Iteration 5: log likelihood = -30993.758 Iteration 6: log likelihood = -30993.396 Conditional (fixed-effects) logistic regression Number of obs = 208025 LR chi2(2) = . Log likelihood = . Prob > chi2 = . ------------------------------------------------------------------------------ indicator | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- s_prod2 | .0985613 . . . . . w_prod2 | .0066312 . . . . . ------------------------------------------------------------------------------ Any help would be greatly appreciated. Stanley Watt Department of Economics Harvard University watt@fas.harvard.edu * * 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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