You wChange the function 'parameter'
sapply(split(variable,list(a,b)),parameter)
On 6/19/07, livia <[EMAIL PROTECTED]> wrote:
>
>
> Hi, I am trying to write a function with the following codes and I would
> like
> it to return the values for "alpha
> beta para parab " seperately. Then I would like to use this funstion for
> "variable" with factor "a" and "b". But the result turns out to be a
> matrix
> with element like "Numeric,2" ... I guess they are just the values for
> "parab", and we can not even see the two parameters in parab.
>
>
> parameter <- function(v) {
> v1 <- v[v>mean(v)+0.5*sd(v)]
> v2 <- v[v<mean(v)-0.5*sd(v)]
> alpha=min(v1)
> beta=max(v2)
> para <- fitgpd(v1,alpha, method="pwmu")$param
> parab <- fitgpd((-v2), (-beta), method="pwmu")$param
> v1.fit <- qgpd(ppoints(v1, a=0.5), alpha, para[1], para[2])
> v2.fit <- qgpd(ppoints((-v2), a=0.5), (-beta), para[1], para[2])
> alpha
> beta
> para
> parab
>
> }
>
> tapply(variable, list(a, b),parameter)
>
>
> I would be grateful if anyone can give me some advice. Many thanks
> --
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>
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--
Christophe Pallier (http://www.pallier.org)
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