Re: Regression analysis -- how-to?

korax1214_at_mailandnews.co.uk
Date: 01/12/05 

Date: 12 Jan 2005 09:37:23 -0800

Joseph McDonnell wrote:
> korax1214@mailandnews.co.uk wrote:
> I suspect what you mean by 'quadratic' is the inclusion of an x^2
term as
> well as an x term. If so, you're still talking about linear
regression
> ('linear' here means linear in the regression parameters, not in the
x's).

Well, my calculator offers "quadratic regression analysis" in which the
data are assumed to conform (or to closely conform) to a parabola
(y=a+bx+cx^2), although the manual also says that it can't calculate a
coefficient of correlation for this type (it doesn't say whether this
is because it's not possible, or because it's not feasible on a
calculator), so (in this case at least) quadratic regression doesn't
seem to be derived from linear, as the other four are (on this
calculator at least).

> ... you seem to have a maths
> (note the spelling) background. I'd recommend Annette Dobson's
> "Introduction to Generalized Linear Models".

Thanks. (I've saved this thread, apart from this reply of course, so
I'll look up this book ASAP.)

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