LISTSERV at the University of Georgia
Menubar Imagemap
Home Browse Manage Request Manuals Register
Previous messageNext messagePrevious in topicNext in topicPrevious by same authorNext by same authorPrevious page (July 2009)Back to main SPSSX-L pageJoin or leave SPSSX-L (or change settings)ReplyPost a new messageSearchProportional fontNon-proportional font
Date:         Sat, 25 Jul 2009 12:16:33 -0700
Reply-To:     SR Millis <srmillis@yahoo.com>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         SR Millis <srmillis@yahoo.com>
Subject:      Re: Non-linear survival anlysis
Comments: To: kornbrot <d.e.kornbrot@herts.ac.uk>
Content-Type: text/plain; charset=utf-8

Have considered using restricted cubic splines? Frank Harrell discusses this method in his book, Regression Modeling Strategies.

It can be easily implemented in R, which is free.

Scott R Millis, PhD, ABPP (CN,CL,RP), CStat, CSci Professor & Director of Research Dept of Physical Medicine & Rehabilitation Dept of Emergency Medicine Wayne State University School of Medicine 261 Mack Blvd Detroit, MI 48201 Email: smillis@med.wayne.edu Tel: 313-993-8085 Fax: 313-966-7682

--- On Sat, 7/25/09, kornbrot <d.e.kornbrot@herts.ac.uk> wrote:

> From: kornbrot <d.e.kornbrot@herts.ac.uk> > Subject: Non-linear survival anlysis > To: SPSSX-L@LISTSERV.UGA.EDU > Date: Saturday, July 25, 2009, 9:54 AM > > > Non-linear survival anlysis > > > Help > > > > I need to do NON_LINEAR cox regression, i.e. would like to > know if the hazard function for death is quadratic as > well as a linear function of the covariate (quantity of > a biomarker) > > > > There is no obvious way to do this using menus and spss > didn’t like ne inserting a quadratic term in the > syntax editor > > Obviously I can create variable that are x^2, x^3 etc of my > predicotr covariate x – but there must be a better > way, as for the usual logistic or regression function > > > > Best > > Diana > > Professor > Diana Kornbrot > > email: d.e.kornbrot@herts.ac.uk > > > web: > http://web.me.com/kornbrot/KornbrotHome.html > > Work > > School of Psychology > > University of Hertfordshire > > College Lane, Hatfield, Hertfordshire AL10 9AB, UK > > > voice: > +44 (0) 170 728 4626 > > fax: +44 (0) 170 > 728 5073 > > Home > > 19 Elmhurst Avenue > > London N2 0LT, UK > > voice: +44 (0) 208 883 > 3657 > > mobile: +44 (0) 796 890 2102 > > > fax: +44 (0) > 870 706 4997 > > > > > > > > > > > > > > > >

===================== To manage your subscription to SPSSX-L, send a message to LISTSERV@LISTSERV.UGA.EDU (not to SPSSX-L), with no body text except the command. To leave the list, send the command SIGNOFF SPSSX-L For a list of commands to manage subscriptions, send the command INFO REFCARD


Back to: Top of message | Previous page | Main SPSSX-L page