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st: RE: AW: Compute mean for groups leaving one member out


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: AW: Compute mean for groups leaving one member out
Date   Fri, 23 Oct 2009 18:31:04 +0100

In words, you get 

1. the total of every value but one value 

2. the number of values - 1 

and divide. But also keep track of missing values too. 

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

Martin Weiss

"Could you suggest a simple way of doing this?"



Taking a cue from Nick`s FAQ cited earlier:


*************
clear*
set obs 40

gen country=_n  
gen quarter=quarterly("1990:1", "YQ")

expand 68
bys country: /* 
*/ replace quarter=quarter+_n-1
format quarter %tq

gen icrg=rnormal(10,100)

//calculate mean
bys quarter: egen totalicrg= /* 
*/ total(icrg)
//divide by # of countries-1
gen mymean=(totalicrg-icrg)/39

//10 random checks...

forv i=1/10{
	local a= 1+int(`c(N)'*runiform())
	l country quarter mymean in `a'
	su icrg if quarter==quarter[`a'] /* 
	*/ & country!=country[`a']
}
*************



HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von kokootchke
Gesendet: Freitag, 23. Oktober 2009 07:39
An: statalist
Betreff: st: Compute mean for groups leaving one member out

Dear all:

I have a panel dataset of 40 countries at quarterly frequency from 1990:1 to
2006:4. I would like to compute the average of a variable (called icrg) for
all countries in a given time period. My problem is that in doing this
computation, I would like to leave one country out of the calculation. 

For example, in period 1990:1 for Mexico, I would like to compute the
average of icrg for ALL other countries in this period EXCLUDING Mexico. 

Could you suggest a simple way of doing this?


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