st: Why does STATA stop in the middle of the bootstrap process?

[Lena Lindahl <lena.Lindahl@sofi.su.se>]

Hi all!
Has anyone encountered the problem that STATA stops in the middle of a 
bootstrap process, without any error message, everything just stops 
after 5-15 iterations and nothing happens. The end of the result file 
looks like this:

bootstrap rho_se = r(rho_se):bs_rho_se
(running bs_rho_se on estimation sample)

Bootstrap replications (50)
----+--- 1 ---+--- 2 ---+--- 3 ---+--- 4 ---+--- 5
...............


This is my bootstrap do-file (I am bootstraping standard errors of a 
correlation):

use "C:\grunddata4.dta", clear
xtmixed lnincome || school:||lopnr:, emiterate(10)
matrix list e(b)
local var_u exp([lns1_1_1]_b[_cons])^2
local var_e exp([lns2_1_1]_b[_cons])^2
nlcom `var_u'/(`var_u'+`var_e')
mat V=r(V)
di as txt "SE = " as res sqrt(V[1,1])

cap program drop bs_rho_se
program bs_rho_se, rclass
xtmixed  lnincome || school:||lopnr:, emiterate(10)
local var_u exp([lns1_1_1]_b[_cons])^2
local var_e exp([lns2_1_1]_b[_cons])^2
nlcom `var_u'/(`var_u'+`var_e')
ret list
tempname V
mat `V' = r(V)
return scalar rho_se = sqrt(`V'[1,1])
end
use "C:\grunddata4.dta", clear
bootstrap rho_se = r(rho_se):bs_rho_se

Best regards Lena


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