[R] Standard correlation

Wolski wolski at molgen.mpg.de
Fri Sep 3 15:41:38 CEST 2004




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On 9/3/2004 at 2:20 PM michael watson (IAH-C) wrote:

>>>OK I better clarify what I mean as it appears it may not be a standard
>>>The pearson correlation coefficient, in laymans terms, uses the shape of
>>>a curve around that curve's average to compare two curves.  The standard
>>>correlation coefficient measures the shape of a curve around zero, and
>>>uses that to compare the two curves.
>>>Therefore a measure that starts at 1 and increases away from zero, and a
>>>measure that starts at -4 and increases towards zero, will be deamed
>>>similar via pearson's correlation coefficient, and dissimilar via the
>>>standard correlation coefficient.  This is useful when "increase away
>>>from zero" is very different behaviour from "increase towards zero".
>>>There are some descriptions here:
>>>-----Original Message-----
>>>From: Stefan Drees [mailto:sdrees at sdrees.de] 
>>>Sent: 03 September 2004 14:03
>>>To: r-help at stat.math.ethz.ch
>>>Cc: michael watson (IAH-C); Stefan Drees
>>>Subject: Re: [R] Standard correlation
>>>On Fri, Sep 03, 2004 at 01:30:36PM +0100 - a wonderful day 
>>>			- michael watson (IAH-C) wrote:
>>>> Is there a function for computing the standard correlation
>>>> coefficient (not pearson) in R?
>>>help (cor) yields the following in my R 1.9.1 installation:
>>>cor(x, y = NULL, use = "all.obs",
>>>          method = c("pearson", "kendall", "spearman"))
>>>.o. e-mail: stefan at drees.name, web: www.sdrees.org, +49 700 SDREESDE ..o
>>>fingerprint = 516C C4EF 712A B26F 15C9  C7B7 5651 6964 D508 1B56 ooo
>>>stefan drees  -  consulting and lecturing  -  problems to tasks
>>>R-help at stat.math.ethz.ch mailing list
>>>PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html

Dipl. bio-chem. Witold Eryk Wolski             @         MPI-Moleculare Genetic   
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tel: 0049-30-83875219                        /   \       
mail: witek96 at users.sourceforge.net        ---W-W----    http://www.molgen.mpg.de/~wolski 
      wolski at molgen.mpg.de

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