[R] enhanced Question to stand. Beta

John Fox jfox at mcmaster.ca
Tue Mar 5 17:27:45 CET 2002

Dear Vito,

At 02:49 PM 3/5/2002 +0100, vito muggeo wrote:
> >a question that connect to the question of Frederik Karlsons >about 'how
> >to stand. betas'
> >With the stand. betas i can compare the influence of the >different
> >explaning variables. What do i with the betas of factors? I can't >use
> >the solution of JohnFox, because there is no sd of an factor. >How can i
> >compare the influence of the factor with the influence of the >numeric
> >variables?
>Use the t-values from summary(lm(....))!
>Are not the standardized regression coefficients the "t values"?

No: The t-values are the ratios of the coefficients to their standard 
errors. What's usually meant by "standardized coefficients" are the 
coefficients obtained when the variables (both response and predictors) are 
standardized to unit variance.


John Fox
Department of Sociology
McMaster University
Hamilton, Ontario, Canada L8S 4M4
email: jfox at mcmaster.ca
phone: 905-525-9140x23604
web: www.socsci.mcmaster.ca/jfox

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