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st: new ineqdeco - capturing results for dynamic decomposition


From   "Stephen P. Jenkins" <stephenj@essex.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   st: new ineqdeco - capturing results for dynamic decomposition
Date   Sat, 9 Sep 2006 09:05:39 +0100 (BST)

The new version of -ineqdeco- on SSC is working fine, as far as I know. The
extended set of saved results was provided explicitly in order to facilitate
calculations of Mookherjee & Shorrocks--type decompositions of changes of
inequality in mind.

You were almost there. The problem is in your code.

The line

         replace GE92=r(ge0_r) if var==`r'

should be

         replace GE92=r(ge0_`r') if var==`r'

                            ^^^^
and similarly in later lines as well.

Note also that macro r(levels) is left behind after -ineqdeco-, precisely to
facilitate the sort of post-calculation looping that you are doing.

You could also loop over r(levels) directly rather than local S, unless of course
you had already just created  local S from r(levels) and have simply not shown us
this.

It is important to use -foreach- as you did, rather than -forvalues- (say), because
-ineqdeco- requires the values of the bygroup variable to be non-negative integers
but they might be non-consecutive integers. r(levels) contains the values of the
bygroup that were actually used in your -ineqdeco, by(bygroup)- command.


> Date: Fri, 8 Sep 2006 10:20:26 -0700 (PDT)
> From: Brian Sartene <brian_sartene@yahoo.com>
> Subject: st: new ineqdeco - capturing results for dynamic decomposition
>
> Dear all:
> I would like to use the new version of Ineqdeco to
> write a program for the dynamic decomposition of the
> GE(0) measure. however, i have two problems.
> First, i have trouble retrieving subgroup-level
> results.
> i am trying the code given below but it is not
> capturing the r(ge0_k) results.
> Second, using the Mookherjee and Shorrocks formulation
> of the decomposition, I can see a need for all the
> subgroup components except the subgroup sum of
> weights.
> I wondered if this is needed for the decomposition, or
> is given for another purpose.
> Thank you in advance.
> Regards,
> Brian
>
>
>
>
> egen var=group(comu)
> levels7 var, local (S)
> ineqdeco hhed [w=expc] if year==1992, by (var)
>
> tempvar GE92 popsh92 relmean92 incsh92 loginc92 GE03
> popsh03 relmean03 incsh03 loginc03 weight92 weight03
> lnlambda92 lnlambda03
>
> foreach r of local S {
> replace GE92=r(ge0_r) if var==`r'
> replace popsh92 = r(v_r) if var==`r'
> replace relmean92=r(lambda_r) if var==`r'
> replace incsh92=r(theta_r) if var==`r'
> replace loginc92=r(lgmean_r) if var==`r'
> replace weight92=r(sumw_r) if var==`r'
> replace lnlambda92=ln(relmean92) if var==`r'
> }


-- 
Professor Stephen P. Jenkins <stephenj@essex.ac.uk>
Institute for Social and Economic Research
University of Essex, Colchester CO4 3SQ, U.K.
Tel: +44 1206 873374.  Fax: +44 1206 873151.
http://www.iser.essex.ac.uk
Survival Analysis using Stata:
http://www.iser.essex.ac.uk/teaching/degree/stephenj/ec968/

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