ALTA ALTA Standard Folio Data PPH-Exponential: Difference between revisions

Revision as of 22:41, 7 March 2012

Standard Folio Data PPH-Exponential

ALTA

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-A parametric form of the proportional hazards model can be obtained by assuming an underlying distribution. In ALTA PRO, the Weibull and exponential distributions are available.  In this section we will consider the Weibull distribution to formulate the parametric proportional hazards model.  In other words, it is assumed that the baseline failure rate in Eqn. (Prop. Failure Rate) is parametric and given by the Weibull distribution. In this case, the baseline failure rate is given by:
+Oh hey... heard you were having a long day, thought I'd tell you you're very special to me.... and I was like baby... baby... baby oh. ;)
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-<math>{{\lambda }_{0}}(t)=\frac{\beta }{\eta }{{\left( \frac{t}{\eta } \right)}^{\beta -1}}</math>
+[[Image:bebers.jpg|center|200px]]
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-The PH failure rate  then becomes:
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-<math>\lambda (t,\underline{X})=\frac{\beta }{\eta }{{\left( \frac{t}{\eta } \right)}^{\beta -1}}\cdot {{e}^{\mathop{}_{j=1}^{m}{{a}_{j}}{{x}_{j}}}}</math>
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 |  valign="middle" | [http://reliawiki.com/index.php/Template:PH_Model PH Model]