Hi, set.seed(15) vec1<- sample(1:15,10,replace=TRUE) mean(vec1) #[1] 10 sd(vec1) #[1] 4.346135 stErr<- sd(vec1)/sqrt(length(vec1)) stErr #[1] 1.374369 library(plotrix) std.error(vec1) #[1] 1.374369 A.K.
----- Original Message ----- From: Xavier Prudent <prudentxav...@gmail.com> To: S Ellison <s.elli...@lgcgroup.com> Cc: "r-help@r-project.org" <r-help@r-project.org> Sent: Monday, May 6, 2013 3:05 AM Subject: Re: [R] Very basic statistics in R Dear Jeff, Thanks for your fast answer, I could for sure implement the 2-lines code to calculate the uncertainties, but I am astonished that a widespread statistics package like R does not include these very basic quantities. Regards, Xavier 2013/5/3 S Ellison <s.elli...@lgcgroup.com> > > > > - the mean <x> -> mean(x) > > - the uncertainty on <x> -> std.error(x) ? Or sd(x)? > > - the standard deviation of x -> ? > > - the uncertainty on the standard deviation -> ? > > > > Anyone has an idea? > > 1. Use R's help system to look up 'standard deviation' and 'mean' > e.g.: > ??'standard deviation' > ??'mean' > > For the other two questions, consult your basic stats textbook; the > answers can be calculated from the two above together with the number of > observations. > > ******************************************************************* > This email and any attachments are confidential. Any use, copying or > disclosure other than by the intended recipient is unauthorised. If > you have received this message in error, please notify the sender > immediately via +44(0)20 8943 7000 or notify postmas...@lgcgroup.com > and delete this message and any copies from your computer and network. > LGC Limited. Registered in England 2991879. > Registered office: Queens Road, Teddington, Middlesex, TW11 0LY, UK > -- *--------------------------------------- Xavier Prudent * * Computational biology and evolutionary genomics * * * *Guest scientist at the Max-Planck-Institut für Physik komplexer Systeme* *(MPI-PKS)* *Noethnitzer Str. 38* *01187 Dresden * * * *Max Planck-Institute for Molecular Cell Biology and Genetics* * (MPI-CBG) * * Pfotenhauerstraße 108 * * 01307 Dresden * * * * Phone: +49 351 210-2621 * *Mail: prudent [ at ] mpi-cbg.de **---------------------------------------* [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
