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From | Diego Bellavia <messadua@yahoo.it> |
To | STATAlist <statalist@hsphsun2.harvard.edu> |
Subject | st: STATA 10: Obtaining and comparing C-statistic in Left Truncation, among nested models |
Date | Sun, 11 Apr 2010 16:38:56 +0000 (GMT) |
Hi all, I have performed a survival analysis deploying Cox Models, correcting for left truncation (time of diagnosis and time of enrollment into the study are not equal). I have built few models with a nested strategy (first model: group of variables A as potential predictors, secondo model: A + B, third model A + B + C etc...). Now, when I use the following command to get the C-stat in STATA 10: estat concordance, noshow I get the following error message: "estat concordance may not be used with late entry or time-varying data", that I cannot overcome Anyone here knows whether there is a way to obtain C-stat and compare different C-stats among different (nested) Cox models in STATA 10, after correcting for left truncation ? Thank you in advance, Diego * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/