meaning of lm( y~., data=mydat ), is it a language feature, is it documented, is it supported?
It's about formula syntax, so ?formula documents it. Bert
On Monday, May 23, 2016, John Sorkin <JSorkin at grecc.umaryland.edu> wrote:
The syntax
mydat <- data.frame( y,x )
fit1 <- lm( y~., data=mydat )
appears to perform a multivariable regression of y on every non-y variable
in the data frame mydat. I can not find this syntax (y~.) in R
documentation. Is y~. a supported feature of the R language? Where can I
find it documented? I would hate to write code that is dependent on a
non-supported, non-documented language feature.
Thank you,
John
John David Sorkin M.D., Ph.D.
Professor of Medicine
Chief, Biostatistics and Informatics
University of Maryland School of Medicine Division of Gerontology and
Geriatric Medicine
Baltimore VA Medical Center
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