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Re: st: Re: Scatterplot of mean values


From   Antoine Terracol <Antoine.Terracol@univ-paris1.fr>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Re: Scatterplot of mean values
Date   Wed, 31 Mar 2010 14:16:15 +0200

you could generate the means and then plot them

sysuse auto, clear
bysort rep78 : egen m_mpg=mean(mpg)
bysort rep78 : egen m_weight=mean(weight)
twoway scatter m_mpg m_weight

here each observation contribute to the plot, which could thus take time to draw. You could limit yourself to one obs per group using

bysort rep78 : gen ok=(_n==1)
and then
twoway scatter m_mpg m_weight if ok


Antoine

	



On 31/03/2010 13:55, Fernando Terrés wrote:
Martin, perhaps I didn't explain it correctly
Let us say that, in the auto.dta dataset, I want to plot the mean values
of mileage against the mean values of weight, both means grouped by
repair record.
I could do:

*************
sysuse auto, clear
collapse mpg weight, by(rep78)
twoway (scatter mpg weight)
*************

My problem is that I need to do the same task for several categorical
variables of a large file, and every collapse forces me to upload the
dataset again.

Thanks again,
Fernando


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