Wednesday, March 08, 2006

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

-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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