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If you take the log10 of an explanatory variable, the estimated effect will be the effect of a 10-fold increase in the original variable, if you take the log2, it will be the effect of a doubling, and if you take natural log it will the effect of a 2.718282-fold increase in the original vaiable. The latter is difficult to sell in publications... Best, Bendix ---------------------- Bendix Carstensen Senior Statistician Steno Diabetes Center Niels Steensens Vej 2 DK-2820 Gentofte Denmark tel: +45 44 43 87 38 mob: +45 30 75 87 38 fax: +45 44 43 07 06 [log in to unmask] www.biostat.ku.dk/~bxc ---------------------- > -----Original Message----- > From: A UK-based worldwide e-mail broadcast system mailing > list [mailto:[log in to unmask]] On Behalf Of Raphael Fraser > Sent: Monday, February 27, 2006 5:08 PM > To: [log in to unmask] > Subject: Cox Regression/ Survival Analysis > > > I am performing a cox regression but have logged one of my > independent variable. How can I interpret this variable? > > Raphael >