[S] conditioning QQ plots for Weibull distribution

Andrew M Kuhn (bisnlsah@hsc.vcu.edu)
Fri, 13 Feb 1998 11:31:38 -0500 (EST)


Hello,

For a dataset with a response, Y, and a discrete grouping variable,
G. I've been trying to create a Weibull qqplot using qqmath or thru the
gui menu system. I'm not having any trouble creating this plot
collapsing over G since I can estimate the relevant parameters that need
to be specified in qqmath or in the distribution dialog box.

To construct this plot for each value of G (it has about 16 levels), I
need to find some way to pass the shape parameters for each group to
either qqmath of the gui. This is the main problem.

I've tried to create a conditioned plot using a common shape parameter
just to see if it works, but S-plus crashed after about 1-2 minutes of
computing.

Any help given is greatly appreciated. I'll have to explain this
procedure to someone who is almost completely S-plus ignorant, so a gui
approach would be great, but I'll take what I can get.

Thanks in advance,

Max

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