st: loop for grid-search

[econqian222 <maguixianstatalist@gmail.com>]

Hi, all
      Thanks for your so many kind help. Unfortunately, I still can’t solve
the problem of writing loop for my grid-search program. Since that my
program can't be combined with “bysort”, that is 
       Bysort product: “my grid-search program” 
My specific data  for this program is listed as below:
product	y	x1hat	x2hat	sigma
1	4.65605	3.82133	.5891969	0.1
1	8.55465	3.273241	.1132121	0.1
1	.5072982	3.273241	.1132121	0.1
2	.0668553	3.781385	.112315	.
2	4.346485	3.999861	.1429252	.
2	.453282	3.389864	.27451	.
3	2.514498	2.554792	.432496	0.5
3	5.027869	3.869841	.1236284	0.5
3	1.121937	3.781385	.112315	0.5

How can I run the following grid-search program by product(1,2,3,…)?

My grid-search program goes as following:

if sigma1 < 1 | sigma1 == . {
local sigma1_hat = .
local rho1_hat = .
}
local SigmaMin = 1.05
local SigmaMax = 131.05
local SigmaJump = 1.0
local J1 = (`SigmaMax' - `SigmaMin')/`SigmaJump' + 2
local J2 = 32 
sort product t

mat uHat = J(`J1',`J2',.)
local row = 2

foreach s of numlist `SigmaMin'(`SigmaJump')`SigmaMax'{  
mat uHat[`row',1] = `s'
local col = 2
local RhoMax = (`s'-1.0)/`s'
local RhoJump = `RhoMax' / (`J2' - 2)
foreach r of numlist 0(`RhoJump')`RhoMax'{
mat uHat[1,`col'] = `r'
qui gen uTemp = y -`cons'-((`r') / ((((`s')-1)^2) * (1-(`r')))) *
x1hat-((2*(`r') -1) / (((`s')-1) * (1-(`r')))) * x2hat 
qui by product: egen sTemp = mean(uTemp)
qui replace sTemp = sTemp*sTemp*(1/period)
qui summ sTemp, d
mat uHat[`row',`col'] = r(sum)
drop uTemp sTemp 
local col = `col' + 1
}
local row = `row' + 1
}
local MinU = uHat[2,2]
local rho_hat = uHat[1,2]
local sigma_hat = uHat[2,1]
local row = 2

foreach s of numlist `SigmaMin'(`SigmaJump')`SigmaMax'{ 
 local col = 2

foreach r of numlist 0(`RhoJump')`RhoMax'{
if `MinU' > uHat[`row',`col'] {
local MinU = uHat[`row',`col']
local rho_grid_hat = uHat[1,`col']
local sigma_grid_hat = uHat[`row',1]
}
local col = `col' + 1
}
local row = `row' + 1
}
foreach var in sigma rho {
capture replace `var'1 = ``var'_grid_hat' 
local `var'1_hat = ``var'_grid_hat' 
}




Many thanks
Qian


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