[R] logistic regression: differential importance of regressors

From: Greg Trafton <trafton_at_itd.nrl.navy.mil>
Date: Fri 20 May 2005 - 05:34:25 EST


Hi, All. I have a logistic regression model that I have run. The question came up: which of these regressors is more important than another?

(I'm using Design)

Logistic Regression Model

lrm(formula = iconicgesture ~ ST + SSP + magnitude + Condition +

    Expertise, data = d)

          Coef    S.E.   Wald Z P     
Intercept -3.2688 0.2854 -11.45 0.0000
ST         2.0871 0.2730   7.64 0.0000
SSP        0.7454 0.3031   2.46 0.0139
magnitude -0.9905 0.6284  -1.58 0.1150
Condition  0.9506 0.2932   3.24 0.0012
Expertise  0.8508 0.2654   3.21 0.0013

The real question is that, since both ST and SSP load significantly into the model, how do I show that ST has a bigger/smaller/similar effect than SSP?

thanks in advance!
greg



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