[R] meaning of sigma from LM, is it the same as RMSE

Roy Mendelssohn roy.mendelssohn at noaa.gov
Thu Apr 5 02:15:47 CEST 2012


?summary.lm

-Roy

On Apr 4, 2012, at 4:47 PM, John Sorkin wrote:

> Please forgive my re-sending this question. I did not see any replies from my prior post. My apologies if I missed something.
> 
> Is the sigma from a lm, i.e.
> 
> fit1 <- lm(y~x)
> summary(fit1)
> summary(fit1)$sigma
> 
> the RMSE (root mean square error)
> 
> Thanks,
> John
> 
> John David Sorkin M.D., Ph.D.
> Chief, Biostatistics and Informatics
> University of Maryland School of Medicine Division of Gerontology
> Baltimore VA Medical Center
> 10 North Greene Street
> GRECC (BT/18/GR)
> Baltimore, MD 21201-1524
> (Phone) 410-605-7119
> (Fax) 410-605-7913 (Please call phone number above prior to faxing)
> 
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**********************
Roy Mendelssohn
Supervisory Operations Research Analyst
NOAA/NMFS
Environmental Research Division
Southwest Fisheries Science Center
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