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Re: st: about residuals and coefficients
From
David Hoaglin <[email protected]>
To
[email protected]
Subject
Re: st: about residuals and coefficients
Date
Fri, 6 Sep 2013 07:00:38 -0400
Federico,
Briefly (I have little time now before leaving to catch a plane), I
had in mind a variety of designed experiments (and some surveys) that
collect data for combinations of levels of several variables. The
design ensures that one can change a given variable and hold other
variables constant, because each of those combinations is supported by
data. The analyses tend to use analysis of variance, rather than
regression.
In any analysis, the data are the key to whether a statement about
holding variables constant is well supported or is an extrapolation of
some kind.
David Hoaglin
On Fri, Sep 6, 2013 at 3:37 AM, Federico Belotti <[email protected]> wrote:
> David
>
> I found your point on the absence of equal conditions unless the data are collected to produce such structure rather intriguing. Could you please clarify your statement?
>
> Tks
> Federico
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