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RE: st: how to compare two skewed distributions, or calculate confidence intervals for quantiles of each?


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: how to compare two skewed distributions, or calculate confidence intervals for quantiles of each?
Date   Wed, 8 Mar 2006 21:23:14 -0000

-qqplot- sounds more direct to me. I am not clear
that predictors enter into the request. 

Nick 
n.j.cox@durham.ac.uk 

Austin Nichols
 
> Sounds like you need -poisson- to me, but if you really want to
> compare quantiles, read -help qreg- and try, say,  -bsqreg wait if
> simulated==0- to get standard errors on the median wait in real data,
> or -bsqreg wait simulated- to compare the median of the real data to
> the simulated data.
 
daniel waxman 

> > I am trying to compare two populations with skewed 
> distributions--queuing
> > times for real patients, and queuing times for simulated 
> patients (the
> > output of a discrete event simulation program).
> >
> > I am most interested in comparing the 50th, 75th, 90th, and 
> 95th percentiles
> > between the real and simulated patients, and am struggling 
> with a way to
> > describe this.

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