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Date:         Thu, 31 May 2001 09:11:50 -0700
Reply-To:     Cassell.David@EPAMAIL.EPA.GOV
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         "David L. Cassell" <Cassell.David@EPAMAIL.EPA.GOV>
Subject:      Re: TIES=EFRON
Content-type: text/plain; charset=us-ascii

Anna Axmon wrote: > could anyone tell me exactly what it is I do when I use TIES=EFRON in the PROC PHREG?

It is a method for handling ties in the failure times. It uses the approximate likelihood method put forth in Efron, 1997, "The efficiency of Cox's likelihood function for censored data", Journal of the American Statistical Association, vol 72, pp. 557-565.

From the online docs:

The Efron likelihood is

Or maybe it means you have to wear one of Brad Efron's ties to get the PROC to work right. :-) David -- David Cassell, CSC Senior computing specialist mathematical statistician

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