[R] Very basic statistics in R

[arun]

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.
>
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-- 
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Xavier Prudent
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Computational biology and evolutionary genomics
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*Guest scientist at the Max-Planck-Institut für Physik komplexer Systeme*
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*Max Planck-Institute for Molecular Cell Biology and Genetics*
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(MPI-CBG)
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Phone: +49 351 210-2621
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*Mail: prudent [ at ] mpi-cbg.de
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