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st: RE: two loops of forval


From   "David Harrison" <david.harrison@icnarc.org>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: two loops of forval
Date   Wed, 23 Feb 2005 16:23:59 -0000

The main observation I would make is that anything you want to do only once for each value of i (everything down to and possibly including the first "some more stuff"?) should go before the -forval j-. At the moment, these commands are being repeated unnecessarily for every different value of j.

I am not familiar with -spatsam- so I can't comment on the use of this.

David

-----Original Message-----
From: Ronnie Babigumira [mailto:ronnie.babigumira@umb.no]
Sent: 23 February 2005 11:19
To: statalist@hsphsun2.harvard.edu
Subject: st: two loops of forval


Dear all
Im having a little trouble with forval. I would like to

1. Use a master data set
2. Keep observations that fall within a given range of a variable of
values and save that as a data set
3. Draw a sample from this smaller data set and then do a few more
things
4. Change the range in 2
5. Repeat 3

here is a really short version of what I have written


forval i = 5000(5000)20000 {
	forval j = 5(5)15 {
		u masterdata, clear
		keep if dfor < `i'
		save buffer_`i', replace
		local expl_vbls "bla bla bla"
		//some more stuff

		u buffer_`i', clear
		spatsam, g(`j') x(x) y(y) norest saving(b`i'_space`j')
replace //draw a subsample
		logit def `expl_vbls'

		//some more stuff
	}
}

Im not sure this is doing what I want it to do. Essentially I would
like to implement the first loop

keep if dfor<`i'< 5000

and then on this portion of the data
implement the second loop forval j = 5(5)15

and then go back to the outer loop and increase the value of `i' and go
over this again.

Kindly advise on how I can proceed with this

Ronnie
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