|From||Shige Song <email@example.com>|
|Subject||Re: st: questions about quantile regresion|
|Date||Sun, 20 Oct 2002 21:50:40 -0700|
First, why use -qreg-? Age (time from birth) to first marriage seems to be a typical time-to-event problem. So, you are looking to survival analyses (Kaplan-Meier, Cox, etc). Look at the -st- set of commands in Stata.
Now, as to the weighting, I'm not sure that the survival commands allow weighting either (have never tried it). Certainly, any inferences for the original population will be biased if you don't use the weights. But I don't see why the COMPARISON across groups (say, men vs. women etc) would be a problem without using the weights. For example, in experimental design, we often fix the distribution of predictors to something artificial (eg, clinical trials fix 1:1 ratio between treatment and control) and we don't use any weighting.
Constantine Daskalakis, ScD
Biostatistics Section, Thomas Jefferson University,
125 S. 9th St. #402, Philadelphia, PA 19107
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