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RE: st: Re: Scatterplot of mean values

From   "Nick Cox" <>
To   <>
Subject   RE: st: Re: Scatterplot of mean values
Date   Wed, 31 Mar 2010 13:31:31 +0100

-egen, tag()- is an automated way of getting Antoine's -ok- variable. (His method is certainly OK.) 


Antoine Terracol

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

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.

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