[R] Interpreting as.factor

[Dimitrios Rizopoulos]

probably you want to look at the help page of ?contr.treatment

I hope it helps.

Best,
Dimitris

---- 
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
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Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm


Quoting Justin Rapp <justin.rapp at gmail.com>:

> When I run a linear regression and include a variable in the
> regression with as.factor  i.e.
> 
> lm(y ~x +as.factor(x1)
> 
> and i read the output as
> as.factor(x1)1....
> as.factor(x1)2...
> etc.
> 
> how do i interpret the estimate for each level?  Is this simply to
> be
> regarded as a shift in the equation predicted by the intercept and
> independent variable x?
> 
> jdr
> 
> 
> -- 
> Justin Rapp
> 409 S. 22nd St.
> Apt. 1
> Philadelphia, PA 19146
> Cell:(267)252.0297
> 
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