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Re: st: about residuals and coefficients
From
Federico Belotti <[email protected]>
To
[email protected]
Subject
Re: st: about residuals and coefficients
Date
Fri, 6 Sep 2013 13:53:41 +0200
David,
tks for your explanation. It is enough.
My request was just to be sure that what I had in mind was the right story.
Federico
On Sep 6, 2013, at 1:00 PM, David Hoaglin wrote:
> 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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--
Federico Belotti, PhD
Research Fellow
Centre for Economics and International Studies
University of Rome Tor Vergata
tel/fax: +39 06 7259 5627
e-mail: [email protected]
web: http://www.econometrics.it
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