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Re: st: Scatter plot


From   Nick Cox <n.j.cox@durham.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Scatter plot
Date   Sun, 27 Apr 2003 16:56:43 +0100

Jeffrey 
 
> Can anyone guide me how to draw the scatter plot of the following
data in Stata 7.
> (y1 vs. x1 and y2 vs. x2 in the same graph). Just the scatter plot
rather than weighted scatter plot with weight option.
> 
> If the mean of y1 and y2 can be added to the graph as a line
respectively, that will be great!
> Thanks.
> 
> x1	y1	x2	y2
> 1	10	2	10
> 1	12	2	10
> 1	12	2	10
> 1	13	2	10
> 1	15	2	10
> 1	15	2	10
> 1	15	2	13
> 1	15	2	13
> 1	15	2	12
> 1	20	2	18
> 1	20	2	19
> 1	20	2	20
> 1	20	2	11
> 1	20	2	11
> 1	25	2	11
> 1	25	2	13
> 1	29	2	14
> 1	30	2	16
> 1	31	2	11
> 1	31	2	10
> 1	32	2	12

Given these data, I suspect that you might 
find 

dotplot y1 y2 

more informative than a scatterplot. 

But in general you would also possibly be better off 
with a different data structure. Here is one way
to do it in Stata 7: 

preserve             (if desired) 

gen id = _n 
reshape long x y, i(id) 
separate y, by(_j) 
label var y1 "y1"
label var y2 "y2" 
su y1, meanonly 
local m1 = r(mean) 
su y2, meanonly 
local m2 = r(mean) 
graph y1 y2 x, yli(`m1' `m2') 

restore             (if desired) 

OR

(apart from the means) see -muxyplot- on SSC. 

Nick
n.j.cox@durham.ac.uk
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