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Re: st: overlay -scatter- plots with consistent weights


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: overlay -scatter- plots with consistent weights
Date   Fri, 17 May 2013 19:00:38 +0100

-separate- (or separate) your y variable into three variables; then draw one -scatter- with three y variables.


On 17 May 2013, at 18:49, Jeph Herrin <stata@spandrel.net> wrote:


I would like to overlay three -scatter- plots representing different conditions and use weights to
indicate the volume, ie:


scatter y1 x if cond1 [w=volume], mcolor(blue) sort msymbol (0h) || /// scatter y1 x if cond2 [w=volume], mcolor(red) sort msymbol(0h) || ///
   scatter y1 x if cond3 [w=volume], mcolor(green) sort msymbol(0h)

the problem is that each plot rescales the size of symbols according the range of weights for respective subsets. Is there a way around this, or a way to color observations on the sme -scatter- plot according to a condition? As is, my observations meeting -cond1- have the smallest volumes but the largest symbols because of the large range of values.

thanks,
Jeph
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