How about this.... (edited lines commented out; some lines reordered)
global maxRMSE=999999999999999999
sum avgunitprice if id==5, detail
global min=r(p5)
global max=r(p95)
*forval i= 1 2 100 {
forval i = 1(2)100 {
scalar j = $min + `i' * ($max - $min) / 100
* gen belowprice=avgunitprice*(avgunitprice<`j')
gen below = avgunitprice < `j'
gen belowprice = avgunitprice * below
* gen aboveprice=avgunitprice*(avgunitprice>=`j')
gen above = avgunitprice >= `j'
gen aboveprice = avgunitprice * above
qui reg lunit below belowprice above aboveprice if id==5, nocons
if e(rmse) < $maxRMSE {
* local $maxRMSE=e(rmse)
global maxRMSE = e(rmse)
reg lunit below belowprice above aboveprice
}
* cap drop below belowprice aboveprice above j
cap drop below belowprice aboveprice above
}
di $maxRMSE
-----------------------------------
Thomas J. Steichen
[email protected]
-----------------------------------
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Nachbar, Dirk
Sent: Monday, June 25, 2007 6:21 AM
To: [email protected]
Subject: st: RE: RE: local variables program
Thanks Maarten
But that still doesn't work properly. I can't really figure it out. See
below for the amended program.
Dirk
global maxRMSE=999999999999999999
sum avgunitprice if id==5, detail
global min=r(p5)
global max=r(p95)
forval i= 1 2 100 {
scalar j=$min+`i'*($max-$min)/100
gen belowprice=avgunitprice*(avgunitprice<`j')
gen below=(avgunitprice<`j')
gen aboveprice=avgunitprice*(avgunitprice>=`j')
gen above=(avgunitprice>=`j')
qui reg lunit below belowprice above aboveprice if id==5, nocons
if e(rmse)<$maxRMSE {
local $maxRMSE=e(rmse)
reg lunit below belowprice above aboveprice
}
cap drop below belowprice aboveprice above j
}
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Maarten Buis
Sent: 25 June 2007 10:59
To: [email protected]
Subject: st: RE: local variables program
--- Nachbar, Dirk
> I want to run some regressions and have problems with the local and
> global variables. I think Stata doesn't like the forval loop. How
should
> I refer to min and max?
>
> local max=999999999999999999
> sum avgunitprice if id==5, detail
> global min=r(p5)
> global max=r(p95)
> forval i= min min+(max-min)/100 to max {
<snip>
Have a look at -help macro- to see how you can refer to locals and
globals. If you want to refer to a global max you type $max, if you
want to refer to a local max you type `max'. Anyhow I would not put
computation inside a -forval- statement, so I would first create a
local with the minimum value and feed that into the -forval-
statement.
Hope this helps,
Maarten
-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands
visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434
+31 20 5986715
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
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