st: 2 dimensional graph for joint distribution

[Lulu Zeng <luluzengnz@gmail.com>]

Dear Statalist

I am having trouble creating a two dimensional joint distribution bar
graph in Stata.

I'm trying to graph the joint distribution of 2 coefficients I
estimated from a nonparametric choice model using fixed mass point
method following Kenneth Train's approach in his 2008 paper (EM
Algorithms for nonparametric estimation of mixing distributions). The
graph I am trying to make is similar to the one on page 65 of Train's
paper: http://elsa.berkeley.edu/~train/EMtrain.pdf

My 2 coefficients (both discrete) are called odo and bill, and the
variable share gives the distribution of the 2 coefficients (share
adds up to 1), for example:

odo       bill        share
0.25      0.58      0.15
0.48      0.93      0.17
0.33      0.20      0.09
0.76      0.64      0.23
0.87      0.28      0.25
0.53      0.83      0.11

I want to graph the joint distribution of odo and bill with them on
the x axis (2 dimensions), and their joint distribution shown as
percentages on the y axis.

Thank you very much for your help in advance.

Best Regards,
Lulu
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