[R] Correlation matrix for data in long format

[Henrique Dallazuanna]

If I understand your question, you can try something like this:

cor(data.frame(lapply(split(x, x$state), "[", 3)))

On 29/01/2008, Serguei Kaniovski <Serguei.Kaniovski at wifo.ac.at> wrote:
> Hello,
>
> I cannot figure out how to use "tapply" to compute the correlation matrix
> in the variable "x" between the states? The data is in long format, e.g.:
>
> state,year,x
> Alabama,2001,0.45
> Alabama,2002,0.47
> Alabama,2003,0.48
> Alabama,2004,0.44
> Arizona,2001,0.34
> Arizona,2002,0.32
> Arizona,2003,0.38
> Arizona,2004,0.36
>
> Thank you in advance for your help,
> Serguei Kaniovski
>
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-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O