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# Re: st: 3D bar plot

 From Maarten Buis To statalist@hsphsun2.harvard.edu Subject Re: st: 3D bar plot Date Wed, 18 Jan 2012 09:03:56 +0100

```On Wed, Jan 18, 2012 at 7:33 AM, Ning Li <ning.li@unimelb.edu.au> wrote:
> What is the command for drawing a 3D bar plot? by 3D bar plot it is meant -
>
> Suppose our data set is {(x,y,z)}={(8.3, 2.3, 2), (9.2, 1.8, 4), (7.1, 0.9, 5)}
> For each point in the (x,y) plate, a vertical bar with height that equals the corresponding z value is drawn. ie., in the position (x,y)=(8.3,2.3), a vertical bar of length 2 is presented, ....
>
> When x and y represent, respectively, within-person mean and within-person standard deviation, and z the frequency of the corresponding pattern, this plot should give a graphic summary of the panel data.

I would look at Nick Cox's -tabplot- (see: -ssc descr tabplot-). It is
not 3D, but I think it does what you want to do. Here is an example:

*---------- begin example ---------------
webuse union, clear
xtset idcode year
bys id: egen m = mean(union)
bys id : egen sd = sd(union)
bys id (year) : gen byte mark = _n == 1

// we need some rounding in this dataset
// to get a readable graph
replace m  = round(100*m ,10)
replace sd = round(100*sd,10)

// the graph
tabplot m sd if mark
*----------- end example ----------------
(For more on examples I sent to the Statalist see:
http://www.maartenbuis.nl/example_faq )

Hope this helps,
Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://www.maartenbuis.nl
--------------------------
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