Date:         Mon, 4 Sep 2006 07:29:22 -0400
Reply-To:     Peter Flom <flom@NDRI.ORG>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Peter Flom <flom@NDRI.ORG>
Subject:      Re: parametric fit of a hazard function which reachs a plateau
Comments: To: stefan.pohl@WISO.UNI-KOELN.DE
Content-Type: text/plain; charset=US-ASCII

>>> Stefan Pohl <stefan.pohl@WISO.UNI-KOELN.DE> 09/04/06 5:09 AM >>>
wrote
<<<
am looking for a parametric distribution which is able to fit this
nonparamatric fit very well (the attached graph was rejected). The
hazard function should increase in the first years until year 7-8 and
then should stay constant.

I have tried an expo-power-distribution which is a very flexible
distribution.
The fit is bad as the hazard function rises over the years and does not
reach a plateau.
>>>

Have you tried a spline fit?  Not sure if this is parametric enough for
you, but it should
fit well

HTH

Peter