Re: st: Standard Error on a Survival median, weighted data

[Steven Samuels <samplerx@earthlink.net>]

On December 17, Millie.Marston wrote:

> I have weighted data but need confidence intervals on the median  
> survival time.   I can pick out the median and get it to come out  
> in sts list (see below)  but the confidence intervals are  
> suppressed  because the data is weighted.  Does anyone know how can  
> I get confidence intervals on the median survival with weighted  
> data without assuming a parametric model



You haven't stated whether the data come from a complex survey.  Even  
if probability weights are the only design feature, I suggest that  
you  -svyset- your data.  Then download  -svybsamp2- (resampling for  
complex survey data)  from SSC, and use it to bootstrap -stsum- .


-Steve


Steven Samuels
845-246-0774
18 Cantine's Island
Saugerties, NY 12477
EFax: 208-498-7441





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