R help - May 2007 - coefficients regression

Hi,
I would like to calculate a polynomial regression with R, but I don't get
the same coefficients as when using SPSS. Is there a way to transform the
coefficients?

I use:
regression <- lm (biomass ~ poly (temperature, 2))

Thank you,
Romana Limberger

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Try:

regression <- lm (biomass ~ poly (temperature, degree=2, raw=TRUE))

See the help page for poly what raw=TRUE does.

Best,

-- 
Wolfgang Viechtbauer
?Department of Methodology and Statistics
?University of Maastricht, The Netherlands
?http://www.wvbauer.com/



----Original Message----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of romi at aon.at
Sent: Monday, May 21, 2007 10:37 To: r-help at stat.math.ethz.ch
Subject: [R] coefficients regression
> Hi,
> I would like to calculate a polynomial regression with R, but I don't
> get the same coefficients as when using SPSS. Is there a way to
> transform the coefficients?  
> 
> I use:
> regression <- lm (biomass ~ poly (temperature, 2))
> 
> Thank you,
> Romana Limberger

Hi,
Thanks a lot for the help.
Best regards,
Romana Limberger

-------------------------------------------
Versendet durch aonWebmail (webmail.aon.at)