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From |
"Clifton Chow" <clifton_chow@post.harvard.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: st: Handling age in Hazard Ratios |

Date |
Mon, 04 Jun 2012 13:24:12 -0500 |

I got it from Wooldridge, p. 193. It's just the maximum. > -------Original Message------- Where did you get the algebra suggesting that .9299/2*1.0007 represents the turning point? di ln(.9299)/(2*ln(1.0007)) > From: Clifton Chow <clifton_chow@post.harvard.edu> > To: statalist@hsphsun2.harvard.edu > Subject: st: Handling age in Hazard Ratios > Sent: 04 Jun '12 12:46 > > I ran a proportional hazards model on the duration of employment and had as my covariates, age and age^2, respectively. The coefficients and hazard ratios for both variables are below: > > Coefficient: Age = -.0727 > Age^2 = .0007 > > Hazard Ratio: Age = .9299 > Age^2 = 1.0007 > > I am trying to interpret the diminishing effect of the quadratic term by calculating the age at which the risk changes from a decrease to ian ncrease risk of job loss. I did this by dividing the age coefficient by 2 * age^2 coefficient. However, when performing this calculation on the raw coefficient, the age of change is 52 (.0727/2*.0007) but in the hazard ratios, that age is 46 (.9299/2*1.0007). Does anyone know which convention to report? I think the difference of 5 years between the two sets of coefficients are important, right? > > Thanks * * 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/

**Follow-Ups**:**Re: st: st: Handling age in Hazard Ratios***From:*Austin Nichols <austinnichols@gmail.com>

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