[R] BY GROUP IN GEV

[Dennis Murphy]

HI:

Since you didn't provide a reproducible example (in particular, what
does str(MA) return?), it's hard to verify what specifically causes
the error, but a look at the gev() function's help page indicates that
the first argument is supposed to be a (numeric) vector, apparently
atomic.

One problem with this code,
CP  <- lapply(MAS, function(x){gev(MAS$CP1, 100, method = "BFGS", control =
list(maxit = 500))})

is that there is no 'x' in the body of the function. Perhaps you need
to generate a numeric vector for CP1 before feeding it to gev(), but
without a reproducible example this is nothing more than speculation.
Perhaps something like:

CP  <- lapply(MAS, function(x){
            y <- as.numeric(x$CP1)
            gev(y, 100, method = "BFGS", control = list(maxit = 500))
         })

Obviously untested for the reason stated above. A perusal of the
Posting Guide might be beneficial.

Dennis

On Mon, Jun 27, 2011 at 3:19 PM, Peter Maclean <pmaclean2011 at yahoo.com> wrote:
> Hi Dennis:
> I tried your suggestions and I am getting the following errors:
>
> Error in x$CP1 : $ operator is invalid for atomic vectors
> In addition: Warning message:
> In sqrt(diag(varcov)) : NaNs produced
>
>  Peter Maclean
> Department of Economics
> UDSM
>
>
>
> ----- Original Message ----
> From: Dennis Murphy <djmuser at gmail.com>
> To: Peter Maclean <pmaclean2011 at yahoo.com>
> Sent: Wed, June 22, 2011 11:37:02 PM
> Subject: Re: [R] BY GROUP IN GEV
>
> Hi:
>
> I think you need
>
> CP  <- lapply(MAS, function(x){gev(x$CP1, 100, method = "BFGS", control =
>                     list(maxit = 500))})
>
> See if that works out.
>
> HTH,
> Dennis
>
> On Wed, Jun 22, 2011 at 4:06 PM, Peter Maclean <pmaclean2011 at yahoo.com> wrote:
>> I am trying to run gev (general extreme value) function in “evir” package. My
>> data is divided by state. I am using the following codes but it is not
> working.
>> I will appreciate any help.
>>
>> #Split data
>> MAS <- split(MA, MA$states)
>>
>> CP  <- lapply(MAS, function(x){gev(MAS$CP1, 100, method = "BFGS", control =
>> list(maxit = 500))})
>>
>> the Error message is:
>>
>> Error in tapply(data, grouping, max) : arguments must have same length
>>
>> I know there are also “by” function,  but I could not figure it out how to use
>> it.
>>
>> ______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
>