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st: monthly moving average


From   Ana Gabriela Guerrero Serdan <ag_guerreroserdan@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: monthly moving average
Date   Mon, 26 Mar 2007 12:12:22 -0700 (PDT)

Dear all, 

Im rising a question again.I hope you understand as Im
new to Stata and Im learning. I want to create a
program that will calculate the proportion of women or
men as a moving average. This proportion will move per
month. 

So basically the first proportion is the number of
women in my data would include months 1-12  for years
1,2,3. The second include months 2-12 for year 1 and
months 1-12 for years 2 and 3. The third would be the
proportion of women in months 3-12 for year 1 and
months 1-12 for year 2 and 3. Etc... 

I have 60,000 observations and looks like:

list	month year  female male sex_unknown

	+-----------------------------------------+
	month   year   female   male   sex_un~n 
	-----------------------------------------
1.	7   2005        0      0          1 
2.	9   2004        0      0          1 
3.	6   2006        0      0          1 
4.	3   2005        0      0          1 
5.	9   2005        0      0          1 
	-----------------------------------------
6.	5   2005        0      0          1 
7.	1   2006        0      1          0 
8.	4   2004        0      0          1 
9.	3   2005        0      0          1 
10.	8   2003        0      1          0 
	-----------------------------------------
11.	11   2003        0      1          0 
12.	11   2005        0      0          1 
13.	8   2006        0      0          1 
14.	6   2005        0      0          1 
15.	10   2006        0      0          1 
	-----------------------------------------
16.	9   2005        0      1          0 
17.	7   2005        0      0          1 
18.	5   2003        0      1          0 
19.	3   2004        0      0          1 
20.	12   2004        0      1          0 


Im trying to  do a simple program like this:
______________________________________
program mvafemale
version 9.2
proportion female if month==1-12 & year==2003-2006,
over(year)

.....// I want to calculate the proportion for all
moving average months

end

mvafemale
_________________________________________

However, when I calculate the first proportion it says
that there are no observations.  I have tried a few
other versions but got stuck. 

Can anyone recommend me something? 

Thanks in advance, 

regards, 
Gaby 

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