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st: Altering individual data markers in a graph


From   Ron Gutmark <rgutmar1@jhmi.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: Altering individual data markers in a graph
Date   Tue, 30 Jun 2009 15:04:04 -0400

Hi,
I am trying to make a scatter plot (of eye pressure vs. age) and
change the color of particular markers.  I have a variable called
"colorcode" in which I store a single letter depending on what color I
want the marker to be (i.e. B for blue, R for red, Y for yellow).

I tried doing this (see below), but it doesn't work:

 gen col = "black"
 replace col = "red" if colorcode == "R"
 replace col = "yellow" if colorcode == "Y"
 replace col = "blue" if colorcode == "B"
 graph twoway (scatter pressure age, mcolor(col))

When I try to make the graph it says: "(note:  named style col not
found in class color, default attributes used"

Any input on what I'm doing wrong and how I can fix it would be
greatly appreciated (or suggestions on other ways to do this).
Thank you!!!

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