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Re: st: RE: how to choose between geographical identifiers??


From   "Clive Nicholas" <Clive.Nicholas@newcastle.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: how to choose between geographical identifiers??
Date   Fri, 10 Mar 2006 00:17:04 -0000 (GMT)

Ada Ma replied:

> Can I use multilevel even if the LADs and TTWAs are overlapping - e.g.
> London is one big TTWA?  And I'm not quite sure how the LADs and TTWAs
> overlap one another across the rest of UK, I can approximate the
> overlapping using the All Field Postcode Directory, but that isn't
> entirely accurate IMHO.

Apologies: my current working hour prevented me from replying to this
sooner than I would have liked.

In short, yes: such overlapping areal units are acceptable. Indeed, the
original MLwiN software by Harvey Goldstein and his group effectively
built such nesting assumptions into the specification and fitting of
multilevel models (i.e., local authority wards at level 1; parliamentary
constituencies at level 2; local authority areas at level 3; etc).

Hope that helps.

CLIVE NICHOLAS        |t: 0(044)7903 397793
Politics              |e: clive.nicholas@ncl.ac.uk
Newcastle University  |http://www.ncl.ac.uk/geps

Whereever you go and whatever you do, just remember this. No matter how
many like you, admire you, love you or adore you, the number of people
turning up to your funeral will be largely determined by local weather
conditions.

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