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Re: st: Interpretation of Curvilinear Effects


From   John Antonakis <john.antonakis@unil.ch>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Interpretation of Curvilinear Effects
Date   Tue, 09 Jun 2009 22:26:04 +0200

Great!  We're on the same page.

Best,
J.

____________________________________________________

Prof. John Antonakis
Associate Dean Faculty of Business and Economics
University of Lausanne
Internef #618
CH-1015 Lausanne-Dorigny
Switzerland

Tel ++41 (0)21 692-3438
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____________________________________________________



On 09.06.2009 23:16, Richard Williams wrote:
At 03:00 PM 6/9/2009, John Antonakis wrote:
Hi Richard:

By plotting I meant:

1. Estimate a regression model that is testing specific theoretical
propositions

2. Plot the fitted model to help understand the nature of the
interaction (I can work it out from the signs of the coefficients;
however, others may need to see the shape of the data)

That's all I meant; there is nothing data-driven about plotting a fitted
model, right?

Sorry, I understand what you mean now. What I was talking about is situations where people plot the data, and then decide, say, that an x^2 term or a log transformation or whatever is called for. You often hear the suggestion that people plot their data, and there is a lot of merit to that, but under the conditions I describe I think it does offer some of the same sorts of problems that sw does.


-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
HOME:   (574)289-5227
EMAIL:  Richard.A.Williams.5@ND.Edu
WWW:    http://www.nd.edu/~rwilliam

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