[R] Applying a function to a subset

[Jim Holtman]

kurtosis(fem[!is.na(fem)])

Sent from my iPad

On May 29, 2011, at 4:54, gaiarrido <gaiarrido at usal.es> wrote:

> Here´s my problem,
> i have developed the function kurtosis (using R-book as a guide) with this
> commands:
> kurtosis<-function(x) {
> m4<-sum((x-mean(x))^4)/length(x)
> s4<-var(x)^2
> m4/s4 - 3 }
> 
> Then create the object fem, which is the difference between the count of a
> trait in the left side of the body minus the right side. It´s a numeric
> variable. But i´ve got no data for some individuals, so in the variable
> "fem" i got numbers and smoe "NA".
> When i try to apply kurtosis to "fem", the NA, don´t allow me to do that,
> that`s what i get:
> 
>> kurtosis(fem)
> [1] NA
> 
> I tried with simple tricks, but i´ve got no results:
>> kurtosis(fem,na.rm=T)
> Error en kurtosis(fem, na.rm = T) : 
>  el argumento(s) no fue utilizado(s) (na.rm = T)
> 
> What can i do? the values of fem vary from -4 to 9.
> 
> Thanks very much
>> kurtosis(fem[fem!="NA"])
> [1] NA
> 
> 
> -----
> Mario Garrido Escudero
> PhD student
> Dpto. de Biología Animal, Ecología, Parasitología, Edafología y Qca. Agrícola
> Universidad de Salamanca
> --
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