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AW: st: Grouping markers


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   AW: st: Grouping markers
Date   Mon, 14 Sep 2009 23:59:19 +0200

<> 



Also note Nick`s http://www.stata-journal.com/sjpdf.html?articlenum=gr0023




HTH
Martin

-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Maarten buis
Gesendet: Montag, 14. September 2009 23:37
An: statalist@hsphsun2.harvard.edu
Betreff: Re: st: Grouping markers

--- On Mon, 14/9/09, Eran Bendavid wrote:
> I am trying to create a scatter plot,
> and I would like to present the markers as belonging to
> separate clusters.  Aside from providing labels, which
> clutter the image too much, is there another useful way to
> do this?  My thought was to cluster by marker color and
> shape, but I'm  open to suggestions.  (For
> example, say I'm graphing price against quantity, and each
> data point comes from a particular city and year, and I
> would like to highlight which data points come from the same
> city.)

My guess is that you will get the clearest representation of your data
with the -by()- option, but the example below also shows how to create
a graph with different markers for different groups. 

Hope this helps,
Maarten

*------------------- begin example ----------------------------
sysuse auto, clear
twoway scatter price mpg, by(rep78)

levelsof rep78
local levs `r(levels)'

foreach lev of local levs {
	local gr "`gr' || scatter price mpg if rep78 == `lev'"
	local leg `"`leg' `lev' "rep78==`lev'" "'
}

twoway `gr', legend(order(`leg'))
*------------------- end example -------------------------------
( For more on how to use examples I sent to statalist see:
http://www.maartenbuis.nl/stata/exampleFAQ.html )

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

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





      

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