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Re: st: QUAIDS with demographic translation


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: QUAIDS with demographic translation
Date   Wed, 29 Aug 2012 13:34:12 +0100

This loop

local j 1

forvalues i = 1/$nminus1 {

local w`i' `:word `j' of `varlist''

local `++j'

}

seems unlikely to be what you intend. You don't need two macros to
loop over a list, and the effect of

local `++j'

is not that of

local ++j

I'd guess that you want

forvalues i = 1/$nminus1 {
                  local w`i' `:word `i' of `varlist''
}

In general, this is a long program and I guess that you are not an
experienced Stata programmer. It is best to use -set trace- and lots
of -display- statements to go through your program line by line.

Nick


On Wed, Aug 29, 2012 at 12:40 PM, Khalida Akhtar Choudhury
<310543@soas.ac.uk> wrote:
> Hello,
>
> I have tried to code my own do file for QUAIDS with demographic
> translation. I am using the approach of Gould & Dong (2004). There are
> two differences between my approach and that of Banks et al. (1997).
> There is a scalar term representing demographic variables(ti(d)) in
> the welfare share equation(wi) and the expenditure m* is now dependent
> on demographic variables.
>
> I get error 198, "nlsurquaids returned 198 verify that nlsurquaids is
> a function evaluator program an error occurred when bootstrap executed
> estimate."
>
> set seed 1
>
> global ngoods =3D 4 // no. of goods
>
> global nbootstraps =3D 3 // no. of bootstrap replications
>
> global anot =3D 6 // alpha_0 parameter
>
>
>
>
> global nminus1 =3D $ngoods - 1
>
>
>
> capture program drop nlsurquaids
>
> program nlsurquaids, rclass
>
>
>
> version 10
>
>
>
> local nv =3D $ngoods + $nminus1 + 1
>
> syntax varlist(min=3D`=3D`nv'' max=3D`=3D`nv'') if, at(name)
>
>
>
> local j 1
>
> forvalues i =3D 1/$nminus1 {
>
> local w`i' `:word `j' of `varlist''
>
> local `++j'
>
> }
>
> forvalues i =3D 1/$ngoods {
>
> local lnp`i' `:word `j' of `varlist''
>
> local `++j'
>
> }
>
> local lnm `:word `j' of `varlist''
>
> local col 1
>
> local d1 :word count `demographics'
>
> // alpha
>
> forvalues i =3D 1/$nminus1 {
>
> tempname a`i'
>
> scalar `a`i'' =3D `at'[1,`col']
>
> local `++col'
>
> }
>
> tempname a${ngoods}
>
> scalar `a${ngoods}' =3D 1
>
> forvalues i =3D 1/$nminus1 {
>
> scalar `a${ngoods}' =3D `a${ngoods}' - `a`i''
>
> }
>
> // beta
>
> forvalues i =3D 1/$nminus1 {
>
> tempname b`i'
>
> scalar `b`i'' =3D `at'[1,`col']
>
> local `++col'
>
> }
>
> tempname b${ngoods}
>
> scalar `b${ngoods}' =3D 0
>
> forvalues i =3D 1/$nminus1 {
>
> scalar `b${ngoods}' =3D `b${ngoods}' - `b`i''
>
> }
>
> // gamma
>
> forvalues i =3D 1/$nminus1 {
>
> forvalues j =3D 1/$nminus1 {
>
> tempname g`i'`j'
>
> if `i' > `j' {
>
> scalar `g`i'`j'' =3D `g`j'`i''
>
> }
>
> else {
>
> scalar `g`i'`j'' =3D `at'[1, `col']
>
> local `++col'
>
> }
>
> }
>
> tempname g`i'${ngoods}
>
> scalar `g`i'${ngoods}' =3D 0
>
> forvalues j =3D 1/$nminus1 {
>
> scalar `g`i'${ngoods}' =3D  `g`i'${ngoods}' - `g`i'`j''
>
> }
>
> }
>
> forvalues j =3D 1/$nminus1 {
>
> tempname g${ngoods}`j'
>
> scalar `g${ngoods}`j'' =3D `g`j'${ngoods}'
>
> }
>
> tempname g${ngoods}${ngoods}
>
> scalar `g${ngoods}${ngoods}' =3D 0
>
> forvalues j =3D 1/${ngoods} {
>
> scalar `g${ngoods}${ngoods}' =3D `g${ngoods}${ngoods}' -  ///
>
> `g${ngoods}`j''
>
> }
>
> // lambda
>
> forvalues i =3D 1/$nminus1 {
>
> tempname l`i'
>
> scalar `l`i'' =3D `at'[1,`col']
>
> local `++col'
>
> }
>
> tempname l${ngoods}
>
> scalar `l${ngoods}' =3D 0
>
> forvalues i =3D 1/$nminus1 {
>
> scalar `l${ngoods}' =3D `l${ngoods}' - `l`i''
>
> }
>
> //omega
>
> forvalues i =3D 1/$nminus1 {
>
> tempname o`i'
>
> scalar `o`i'' =3D `at'[1,`col']
>
> local `++col'
>
> }
>
>
>
> quietly {
>
> tempvar lnpindex
>
> gen double `lnpindex' =3D $anot
>
> forvalues i =3D 1/$ngoods {
>
> replace `lnpindex' =3D `lnpindex' + `a`i''*`lnp`i''
>
> }
>
> forvalues i =3D 1/$ngoods {
>
> forvalues j =3D 1/$ngoods {
>
> replace `lnpindex' =3D `lnpindex' +  ///
>
> 0.5*`g`i'`j''*`lnp`i''*`lnp`j''
>
> }
>
> }
>
> tempvar bp
>
> gen double `bp' =3D 0
>
> forvalues i =3D 1/$ngoods {
>
> replace `bp' =3D `bp' + `lnp`i''*`b`i''
>
> }
>
> replace `bp' =3D exp(`bp')
>
> forvalues i =3D 1/$nminus1 {
>
> replace `w`i'' =3D `a`i'' + `o`i''*`demographics'
>
> forvalues j =3D 1/$ngoods {
>
> replace `w`i'' =3D `w`i'' + `g`i'`j''*`lnp`j''
>
> }
>
> replace `w`i'' =3D `w`i'' +  ///
>
> `o`i''*`demographics'+ ///
>
> `b`i''*(`lnm' - `lnpindex') + ///
>
> `l`i''/`bp'*(`lnm' - `lnpindex')^2
>
> }
>
> }
>
>
>
> end
>
>
>
> // This program fits the QUAIDS model, then it calculates the elasticities
>
> // at the sample means.
>
>
>
> capture program drop estimate
>
> program estimate, rclass
>
>
>
> // Build up nlsur command
>
> forvalues i =3D 1/$nminus1 {
>
> local vlist `vlist' w`i'
>
> local alist `alist' a`i'
>
> local blist `blist' b`i'
>
> local llist `llist' l`i'
>
> local tlist `olist' o`i'
>
> }
>
> forvalues i =3D 1/$ngoods {
>
> local vlist `vlist' lnp`i'
>
> }
>
> local vlist `vlist' lnexp
>
> forvalues i =3D 1/$nminus1 {
>
> forvalues j =3D `i'/$nminus1 {
>
> local glist `glist' g`i'`j'
>
> }
>
> }
>
> nlsur quaids @ `vlist', ifgnls nequations($nminus1) ///
>
> param(`alist' `blist' `glist' `llist'`olist')
> *
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