Re: st: index vs score definitions

[Nick Cox <njcoxstata@gmail.com>]

A score can be anything from a variable so named (test score) to
something produced by a calculation (z score, PC score, factor score).
There is not really a distinction there as someone's test score
imported as data is someone else's test score produced by a
calculation (which might be quite elaborate).

An index can also be a variable so named (BMI is a good example). The
same minor diversity prevails: something like a price index could
demand quite a lot of calculation.

I suppose that both often have the same flavour that various inputs
are being combined.

I doubt that there are rigorous definitions that somebody else might
not object to. In particular contexts, index and score could be (a)
accepted terminology (b) defined quite unequivocally, but in general
they are just broad words.

That's my take.

See also http://www.retrologic.com/jargon/C/coefficient-of-X.html for
a less reverent view.
Nick
njcoxstata@gmail.com


On 29 August 2013 16:14, Marcos Vinicius <bioestatistico@inbox.com> wrote:
> Hello,
>  I would be grateful if someone could tell me if there is a formal definition for ‘score` (ex:Glasgow score)and also  `index`  (ex:BMI )or if theses terminological terms differs  concerning theirs  definitions?
> Thanks
> Vinicius
>
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