topic Re: How to get hazard function in LIFEREG? in SAS Procedures https://communities.sas.com/t5/SAS-Procedures/How-to-get-hazard-function-in-LIFEREG/m-p/153678#M40411 <HTML><HEAD></HEAD><BODY><P>If scale dominates shape, and shape is greater than 1, that function will be very flat, and look much like shape to the scale power for all values of age.&nbsp; You might consider rescaling age to a "smaller" number that still captures the full variability, but such that xbeta*age (which is what should be exponentiated, I think), and scale are of the same order of magnitude.</P><P></P><P>Steve Denham</P></BODY></HTML> Fri, 06 Feb 2015 14:17:51 GMT SteveDenham 2015-02-06T14:17:51Z How to get hazard function in LIFEREG? https://communities.sas.com/t5/SAS-Procedures/How-to-get-hazard-function-in-LIFEREG/m-p/153677#M40410 <HTML><HEAD></HEAD><BODY><P>Hi I am a beginner in SAS. I have data regarding whether people withdraw or not based on issue age and tax type. From what I understand PROC LIFETEST will not take into account all the other covariates. </P><P></P><P>For this reason I used PROC LIFEREG with a Weibull distrbution. I have the fitted beta parameters as well as the scale, shape for the weibull but I am not sure how to get at the hazard function for each row of data? I am interested in getting the conditional probability of failure if you have survived up to that point.&nbsp; I tried </P><P>hazard function = scale*exp(-xbeta)*(shape)^(scale-1)&nbsp; </P><P></P><P>but the function does not seem to vary much with age. Any help?</P></BODY></HTML> Wed, 04 Feb 2015 21:29:30 GMT https://communities.sas.com/t5/SAS-Procedures/How-to-get-hazard-function-in-LIFEREG/m-p/153677#M40410 actuary86 2015-02-04T21:29:30Z Re: How to get hazard function in LIFEREG? https://communities.sas.com/t5/SAS-Procedures/How-to-get-hazard-function-in-LIFEREG/m-p/153678#M40411 <HTML><HEAD></HEAD><BODY><P>If scale dominates shape, and shape is greater than 1, that function will be very flat, and look much like shape to the scale power for all values of age.&nbsp; You might consider rescaling age to a "smaller" number that still captures the full variability, but such that xbeta*age (which is what should be exponentiated, I think), and scale are of the same order of magnitude.</P><P></P><P>Steve Denham</P></BODY></HTML> Fri, 06 Feb 2015 14:17:51 GMT https://communities.sas.com/t5/SAS-Procedures/How-to-get-hazard-function-in-LIFEREG/m-p/153678#M40411 SteveDenham 2015-02-06T14:17:51Z