Very basic statistics in R
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 <prudentxavier at gmail.com> To: S Ellison <S.Ellison at lgcgroup.com> Cc: "r-help at r-project.org" <r-help at 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.Ellison at 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 postmaster at 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 f?r Physik komplexer Systeme* *(MPI-PKS)* *Noethnitzer Str. 38* *01187 Dresden * * * *Max Planck-Institute for Molecular Cell Biology and Genetics* * (MPI-CBG) * * Pfotenhauerstra?e 108 * * 01307 Dresden * * * * Phone: +49 351 210-2621 * *Mail: prudent [ at ] mpi-cbg.de **---------------------------------------* ??? [[alternative HTML version deleted]] ______________________________________________ R-help at 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.