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st: Interpreting effect of covariate with min 0.2 and max 1.04 on odds/time ratios in PH and AFT models


From   Erik Aadland <erikaadland@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Interpreting effect of covariate with min 0.2 and max 1.04 on odds/time ratios in PH and AFT models
Date   Mon, 15 Aug 2011 08:40:28 +0000

Dear statalist.
 
I am estimating Weibull PH and AFT models.
One of my timevarying covariates has a min of 0.2 and a max of 1.04.
I want to interpret the effect of different values on this variable on the odds/time ratio.
The values on this covariate are 0.2, 0.4, 0.6, 0.8, 0.9 and 1.04.
 
The odds/time ratio reported is for each one unit increase in this covariate (I take it the one unit increase is 1).
A one unit increase (1) does not reflect the values on my covariate well. 
Is there a way to get around this problem?
 
Any input is much appreciated.
 
Kind regards,
 
Erik. 		 	   		  
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