The free ARC software from the University of Minnesota will do some of this.
Look at
http://stat.umn.edu/ARCHIVES/archives.html
Jon Cryer
At 01:59 PM 4/10/00 -0500, you wrote:
>
>Hello all,
>
>I'm looking for software that can display a 3-D regression environment (x,
>y, and z variables) and draw a regression plane for each of two subgroups.
>
>So far, Minitab does a good job of the 3-D scatterplots (regular,
>wireframe, and surface (plane) plots), but there's no option (as in the
>regular scatterplots) to either code data points according to categorical
>variables or to overlay two graphs on the same set of axes.
>
>I'm saving the data in both Minitab and SPSS files, and I can easily
>convert to Excel (as a standard go-between spreadsheet file).
>
>Any help will be greatly appreciated. The effect in my research that I'm
>finding so far is that my two groups look similar in univariate and
>bivariate settings, but the trivariate regression planes are different. I
>know I could do what I needed to with regression equations (and will do
>so), but I'd l-o-v-e to have some graphs to go with it. SPSS will be fine
>for the actual regression equations-- it can deal with subgroups like
>that.
>
>Thank you very much in advance,
>
>Cherilyn Young
>
>
>
>
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