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From |
"Carlo Lazzaro" <carlo.lazzaro@tiscalinet.it> |

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

Subject |
st: R: stpiece - general hazard estimation question |

Date |
Fri, 31 Jul 2009 08:03:27 +0200 |

Steven wrote: <In my first time period for my firms, I have no exits so the hazard coefficient is very low. Unfortunately, because there are no exits it also indicates it is non-significant. (p=.969).> At first glance, this result would seem consistent with your data generating process: no exits mean very low hazard and very high p-value. Probably, the best solution here is try to explain (eg. according to the economic theory or taking a look at previous researches in the same field) why this result is or is not reasonable. <Given there are no standard errors if there is not an exit..> This statement seems a little bewildering, as you actually reported a standard error for TP1 (528.1418). HTH and Kind Regards, Carlo -----Messaggio originale----- Da: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Per conto di Bradley, Steve Inviato: giovedì 30 luglio 2009 23.54 A: 'statalist@hsphsun2.harvard.edu' Oggetto: st: stpiece - general hazard estimation question Statlisters, I have a question regarding the estimation of hazards when there isn't one for a particular time period. In my first time period for my firms, I have no exits so the hazard coefficient is very low. Unfortunately, because there are no exits it also indicates it is non-significant. (p=.969). _t Coef. Std. Err. z P>z TP1 -20.66249 528.1418 -0.04 0.969 TP2 -5.362681 .8858187 -6.05 0.000 TP3 -5.62141 .7207315 -7.80 0.000 As an experiment, if I add one firm exit during time period 1 to confirm this is an estimation problem I get: _t | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+-------------------------------------------------------------- -- TP1 | -7.638006 1.206193 -6.33 0.000 -10.0021 -5.273911 TP2 | -4.855396 .782516 -6.20 0.000 -6.3891 -3.321693 TP3 | -5.48794 .711463 -7.71 0.000 -6.882382 -4.093498 I am wondering if there is an appropriate solution to this problem. Given there are no standard errors if there is not an exit, can I consider the standard error 0 and use the original coefficient or is it unreliable as well? Thanks! Steven W. Bradley, Ph.D. Department of Management & Entrepreneurship One Bear Place #98006 Baylor University Waco, TX 76798 (office) 254.710.3921 steve_bradley@baylor.edu * * 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/ * * 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/

**References**:**st: stpiece - general hazard estimation question***From:*"Bradley, Steve" <Steve_Bradley@baylor.edu>

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