[R] sample size for linear regression

[Ingmar Visser]

Length(y) is typically considered the sample size but apparantly not what
you're looking for ...
Does fortune(172) apply here?
Best, Ingmar


> From: John Sorkin <jsorkin at grecc.umaryland.edu>
> Date: Mon, 20 Nov 2006 20:13:06 -0500
> To: <r-help at stat.math.ethz.ch>
> Subject: [R] sample size for linear regression
> 
> Is there an R function that can be used to calculate a sample size for a
> linear regression:
> i.e.
> Given a linear regression:
> y=f(x,z)
> i.e. fit1<-lm(y~x+z)
> is there a function which can be passed coef(z), SE(z), and other
> parameters to determine a sample size based on z, SEz and other
> information from the regression?
> Thanks,
> John
> 
> 
> John Sorkin M.D., Ph.D.
> Chief, Biostatistics and Informatics
> Baltimore VA Medical Center GRECC,
> University of Maryland School of Medicine Claude D. Pepper OAIC,
> University of Maryland Clinical Nutrition Research Unit, and
> Baltimore VA Center Stroke of Excellence
> 
> University of Maryland School of Medicine
> Division of Gerontology
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> 10 North Greene Street
> GRECC (BT/18/GR)
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> 
> (Phone) 410-605-7119
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