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

[Nick Cox <njcoxstata@gmail.com>]

-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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