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st: Postlist for bootstrap


From   Vincenzo Carrieri <vincenzo.carrieri@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Postlist for bootstrap
Date   Mon, 3 Jun 2013 17:26:14 +0200

Dear Statalisters,
I am trying to implement bootstrap estimations of standard errors for
concentration indexes but I get an error like: the variable "sesso"
(name of the first variable that I use in the regression) was not
found. I think that the problem is mostly on the use of postfile but I
cannot find the solution.

Here an example of what I did using just few variables.

I first using data:

use "C:\Users\User\Desktop\TEST.dta", replace

Then I Declare variable names and filename of dataset where results
will be stored

postfile test2 my ciy m01 b01 ci01 using
"C:\Users\User\Desktop\TEST.DTA",replace

Then I launch my programme

capture program drop index
program define index
regress sesso eta
predict sesso
sum sesso
scalar my = r(mean)
sum eta
scalar m01=r(mean)

tempname my ciy m01 b01  ci01
sca b01 = _b[eta]
gen rank=reddito

I compute  concentration indices
  corr rank sesso        , c
     sca ciy           = 2*r(cov_12)/my
  corr rank eta        , c
     sca ci01           = 2*r(cov_12)/m01

post stak my ciy m01 b01 ci01

end

Up to now everything is ok.


Finally I do boostrap:

bootstrap , reps(10) : index

Here I get the error message: variable sesso not found an error
occurred when bootstrap executed index


My code  would continue:

I close the postfile

postclose test2

use "C:\Users\User\Desktop\test.dta", replace

sum my ciy m01 b01 ci01


Anyone can help me to understand what is wrong in my bootstrap programming?

Any help is appreciated.
Thanks,

Vincenzo
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