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From |
Nick Cox <njcoxstata@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: loops for regions |

Date |
Wed, 5 Sep 2012 23:35:02 +0100 |

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/

**Follow-Ups**:**Re: st: loops for regions***From:*Chiara Mussida <cmussida@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>

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