[R] VGAM package : Frechet distribution - 2 parameter estimation

[Thomas Yee]

Hello,

a day or two ago I submitted VGAM 0.9-5 to CRAN, which has
myriads of changes to family functions---their names, their
arguments, and their order thereof. Especially regarding
family functions for discrete and continuous distributions.

In a nutshell, I found lots of inconsistencies while writing
my book, and it was deemed necessary to standardize things.
I just had to bite the bullet, so to speak. I have tried
to summarize all changes in the NEWS file, however, a few
might have gone undocumented. Users of previous versions
of VGAM are cautioned to check their code. My apologies
for this inconvenience.

I have always tried to make it plain that while the
version number was less than 1.0-0, everything was subject
to change. But the book "Vector Generalized Linear and
Additive Models", for Springer, should appear next year,
it is synchronized with version 1.0-0, so that should end
most of these disruptive changes :) Or at least, curtail them
(hopefully).

cheers

Thomas

ps. for this particular problem, only frechet() remains.




On 06/11/14 23:12, Rolf Turner wrote:
>
> Dear Ms. Gobin,
>
> There would appear to be a typo in the package manual that appears on 
> CRAN.  Doing ?Frechet (it would be nice to have this aliased also to 
> "frechet") points you immediately to frechet.  With "frechet2" 
> substituted for "frechet" your code, everything works.
>
> cheers,
>
> Rolf Turner
>
> On 06/11/14 22:34, Katherine Gobin wrote:
>> Dear Mr Michael,
>>
>> Thanks a lot for your guidance. The pdf file describing VGAM package 
>> has mentioned 'frechet' in the example, so I got the error.
>>
>> Regards
>> Katherine
>>
>>
>> On Thursday, 6 November 2014 2:54 PM, Michael Dewey 
>> <info at aghmed.fsnet.co.uk> wrote:
>>
>>
>>
>>
>>
>> On 06/11/2014 06:04, Katherine Gobin wrote:
>>> Dear R forum,
>>>
>>> I am trying to execute following code (Page no 259 - VGAM.pdf)
>>>
>>> # 
>>> .........................................................................................................................
>>>
>>> library(VGAM)
>>>
>>> set.seed(123)
>>> fdata <- data.frame(y1 = rfrechet(nn <- 1000, shape = 2 + exp(1)))
>>> with(fdata, hist(y1))
>>> fit2 <- vglm(y1 ~ 1, frechet, data = fdata, trace = TRUE)
>>>
>>> # 
>>> .........................................................................................................................
>>>
>>
>> Is it not called frechet2?
>>
>>>
>>> However, I receive following error
>>>
>>> Error in vglm(y1 ~ 1, frechet, data = fdata, trace = TRUE) :
>>>     object 'frechet' not found
>>>
>>>
>>> Earlier there used to be a function called "frechet3" which I guess 
>>> has been withdrawn by VGAM.
>>>
>>> Kindly guide
>>>
>>> Katherine
>