R help - Feb 2012 - covariance

can any one please tell me how can I Compute the covariance matrix of  (Y)
which is 5 variables .. without using a built-in function??????    


2)  how (cov) works ( I need to get the details for this function ???

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Yes, the function is based on the idea that you have two random variables, X and
Y and the covariance is then computed as

Cov(x,y) = E[(X - E(X)) (Y - E(Y))]

Where E[.] is the expectation operator.
> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at
r-project.org] On
> Behalf Of Ali2006
> Sent: Friday, February 17, 2012 2:37 PM
> To: r-help at r-project.org
> Subject: [R] covariance
> 
> can any one please tell me how can I Compute the covariance matrix of  (Y)
> which is 5 variables .. without using a built-in function??????
> 
> 
> 2)  how (cov) works ( I need to get the details for this function ???
> 
> --
> View this message in context: http://r.789695.n4.nabble.com/covariance-
> tp4398242p4398242.html
> Sent from the R help mailing list archive at Nabble.com.
> 
> ______________________________________________
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> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

This sounds remarkably like homework. You can address your own issue using
the built-in help system and R's capability to allow you to view source code
for functions, but we can't help you do your assignments.

Sarah

On Fri, Feb 17, 2012 at 2:36 PM, Ali2006 <nasser-d2006 at hotmail.com>
wrote:
> can any one please tell me how can I Compute the covariance matrix of ?(Y)
> which is 5 variables .. without using a built-in function??????
>
>
> 2) ?how (cov) works ( I need to get the details for this function ???
>

-- 
Sarah Goslee
http://www.functionaldiversity.org

On Feb 17, 2012, at 2:36 PM, Ali2006 wrote:
> can any one please tell me how can I Compute the covariance matrix  
> of  (Y)
> which is 5 variables .. without using a built-in function??????
>
>
> 2)  how (cov) works ( I need to get the details for this function ???
http://cran.r-project.org/doc/Rnews/Rnews_2006-4.pdf
>
-- 

David Winsemius, MD
West Hartford, CT

could you help with example ??

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