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Re: st: analysis of continuous gestational age


From   "Svend Juul" <SJ@SOCI.AU.DK>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: analysis of continuous gestational age
Date   Sun, 1 Apr 2007 20:01:07 +0200

Ali wrote:
 
I am using a very large dataset (N=1.3m) to analyse the effect
of a categorical variable on gestational age (continuous variable).
I used linear regression (regress) but as you would probably expect
the residuals are not normally distributed. I used qreg but the
results do not look right.
 
Could anyone tell me what is the best analysis for continuous
gestational please.
--------------------------------------------------------------
 
Your outcome variable is time to an event; this calls for survival
analysis, e.g. -stcox-. There are requirements for Cox regression
too, so be careful.
 
Hope this helps
Svend

_______________________________________________________ 
 
Svend Juul
Institut for Folkesundhed, Afdeling for Epidemiologi
(Institute of Public Health, Department of Epidemiology)
Vennelyst Boulevard 6 
DK-8000 Aarhus C,  Denmark 
Phone, work:  +45 8942 6090 
Phone, home:  +45 8693 7796 
Fax:          +45 8613 1580 
E-mail:       sj@soci.au.dk 
_________________________________________________________ 

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