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Sorry for the subject-less post.
Steve
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
stset time [pw=weight],fail(fail)
stsum
local median=r(p50)
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. 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 USA
EFax: 208-498-7441
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