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From |
Chiara Mussida <cmussida@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: loops for regions |

Date |
Thu, 6 Sep 2012 09:05:15 +0200 |

The reference is : D.M. Lilien, Sectoral shifts and cyclical unemployment, Journal of Political Economy, 90 (4) (1982), pp. 777–793. The index is defined on page 787. It is a bit more complicated than the herfindahl index. On 06/09/2012, Nick Cox <njcoxstata@gmail.com> wrote: > Did you try > > findit lilien > > Someone may recognise this, but you give no reference or definition. > > Nick > > On Wed, Sep 5, 2012 at 9:52 PM, Chiara Mussida <cmussida@gmail.com> wrote: >> tried to write my own file since the next step will be, as i hope, to >> compute a Lilien index for each region. I tried to search for a stata >> program but i did not succeed. Does anybody know whether it exists? >> Thanks >> >> On 05/09/2012, Nick Cox <njcoxstata@gmail.com> wrote: >>> The first line confuses the -if- command and the -if- qualifier. >>> >>> I didn't look in detail at later code, as there should be no need to >>> write your own code, as many programs exist. -search inequality- for a >>> start. See also e.g. -ineq- (SSC), -hhi- (SSC). >>> >>> In fact, in many ways this is a calculator problem easily tackled with >>> Mata. >>> >>> . mata >>> : freq = (0, 0, 3, 9, 9) >>> : pr = freq :/ sum(freq) >>> : sum(pr:^2) >>> .387755102 >>> >>> In fact, zero frequencies map to zero squared proportions and can be >>> omitted. >>> >>> This index, although often attributed to Herfindahl by economists who >>> know only their only literature, was in essence invented decades >>> before by Gini. I don't have the reference in my head, but I think it >>> is in Bishop, Y., Fienberg, S.E. and Holland, P.W. 1975. Discrete >>> multivariate analysis. Cambridge, MA: MIT Press. Please trump me by >>> providing a yet earlier reference. >>> >>> Nick >>> >>> On Wed, Sep 5, 2012 at 5:15 PM, Chiara Mussida <cmussida@gmail.com> >>> wrote: >>> >>>> I want to generate a variable herf1 which takes the value of the below >>>> index for region 1, and thereafter repeat this loop for all the region >>>> in my dataset. The problem is that with the below command I get the >>>> herf1 index for region 1, which is identycal in value (I tried) to the >>>> herf2 for region2 whether I repeat this llop for region2, by starting >>>> with "if reg==2, and so forward for all the regions. >>>> >>>> if reg==1 { >>>> tab cat12_2, gen(categ) >>>> forvalues k = 1 2 to 12 { >>>> sum categ`k', meanonly >>>> gen share`k'=r(mean) if reg==1 /*shares of each occ cat on the >>>> total >>>> occupation, time t*/ >>>> } >>>> } >>>> >>>> gen herf1=(share1)^2 + (share2)^2 + (share3)^2 + (share4)^2 + >>>> (share5)^2 + (share6)^2 + (share7)^2 + (share8)^2 /// >>>> + (share9)^2 + (share10)^2 + (share11)^2 + (share12)^2 /*Herfindhal >>>> Index Region1*/ >>>> the variable reg takes 1 for region1, 2 for region2...up to 20 for >>>> region20. In other words, Stata does not compute the specific index >>>> for each region, but the same index region by region. >>> * >>> * For searches and help try: >>> * http://www.stata.com/help.cgi?search >>> * http://www.stata.com/support/statalist/faq >>> * http://www.ats.ucla.edu/stat/stata/ >>> >> >> >> -- >> Chiara Mussida >> PhD candidate >> Doctoral school of Economic Policy >> Catholic University, Piacenza (Italy) >> * >> * For searches and help try: >> * http://www.stata.com/help.cgi?search >> * http://www.stata.com/support/statalist/faq >> * http://www.ats.ucla.edu/stat/stata/ > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > -- Chiara Mussida PhD candidate Doctoral school of Economic Policy Catholic University, Piacenza (Italy) * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: loops for regions***From:*Nick Cox <njcoxstata@gmail.com>

**References**:**st: loops for regions***From:*Chiara Mussida <cmussida@gmail.com>

**Re: st: loops for regions***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: loops for regions***From:*Chiara Mussida <cmussida@gmail.com>

**Re: st: loops for regions***From:*Nick Cox <njcoxstata@gmail.com>

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