There is no way this approach will work. -mcolor()- will not look inside a string variable. Also, each scatter plot uses precisely one colour. However, the problem is soluble otherwise.
One way to proceed is as follows:
graph twoway (scatter pressure age if colorcode == "R", mcolor(red))
(scatter pressure age if colorcode == "Y", mcolor(yellow))
(scatter pressure age if colorcode == "B", mcolor(blue))
Another is to use -separate- first. See the online help.
Also see
SJ-5-4 gr0023 . . . . Stata tip 27: Classifying data points on scatter plots
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N. J. Cox
Q4/05 SJ 5(4):604--606 (no commands)
tips for using separate, gray-scale gradation, and text
characters as class symbols to classify data points on
a scatter plot
Nick
[email protected]
Ron Gutmark
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).
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