In case it helps, the HH index is a standard measure of market concentration in industrial economics and related fields.
According to the relevant Wikipedia page "[t]he measure is essentially equivalent to the Simpson diversity index used in ecology".
Julian
Dr Julian Wells
Acting Director of Studies
School of Economics
staff web-page: http://fass.kingston.ac.uk/staff/cv.php?staffnum=287
personal web-site: http://staffnet.kingston.ac.uk/~ku32530
Senior lecturer in economics
School of Economics
Faculty of Arts and Social Sciences
Kingston University
Penrhyn Road
Kingston-upon-Thames
KT1 2EE
United Kingdom
+44 (0)20 8417 2341
> -----Original Message-----
> From: email list for Radical Statistics [mailto:[log in to unmask]]
> On Behalf Of Nigel Waters
> Sent: 17 November 2010 13:33
> To: [log in to unmask]
> Subject: Re: [RADSTATS] Help urgently needed
>
> Interesting. We have just published a paper on access issues re myocardial
> infarction. We are still working on this and hope to develop optimization
> models which were not considered in the published paper. Here's the link
> to the published work:
>
> http://www.openmedicine.ca/article/view/302/298
>
> For an entirely different problem -- sub-prime mortgages in the US 2005-
> 2008 -- we used the H-H index as a measure of the changing competitiveness
> of that market. That paper has been accepted for E&P A and so is not yet
> available for distribution.
>
> I'll take a look at the papers that Alison has mentioned and see if I can
> help.
>
> Nigel Waters
> PS Happy GIS Day!
>
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