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Also, in an earlier message I think you said that you expected the
joint distribution to be bell-shaped.  Why do you expect that shape?

David Hoaglin

On Thu, Oct 31, 2013 at 5:06 AM, Lulu Zeng <luluzengnz@gmail.com> wrote:
> Dear Statalist,
>
> My apologies for keep coming back with the same topic.
>
> I am trying to use -surface- to graph the joint distribution of odo
> and bill. I want the value of odo on the x axis and bill on y axis,
> and their joint distribution jd (a square matrix) on the z axis. jd is
> calculated from share, which is the individual distribution of odo and
> bill.
>
> I understand -surface- needs the z axis to be a singular variable,
> however, my jd is a n by n matrix (calculated by share multiplied by
> its inverse).
>
> Could you please advise if there is a way to do this?
>
> Best Regards,
> Lulu
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