Hi,
then, If I replace the midpoint 0.0025 average values equal to 0there won't be
prejudice in the results?Would then be the best thing to do?
regards,
> Subject: Re: [R] help error: In dweibull(x, shape, scale, log) : NaNs
> produzidos
> From: pda...@gmail.com
> Date: Tue, 21 Feb 2012 18:55:51 +0100
> To: vanucia-schumac...@hotmail.com
>
>
> On Feb 21, 2012, at 18:34 , Vanúcia Schumacher wrote:
>
> > Thank's,
> >
> > but then I could simply round off my data which are equal to zero to
> > 0.00001?
>
> Something like that. I'd maybe try something a little more carefully
> considered. E.g. if your data are rounded to two decimal figures, the "zeros"
> represent values of x with
>
> 0 < x < 0.005
>
> since anything bigger would be rounded to 0.01. So replace with the interval
> midpoint of 0.0025.
>
> (One can do better by modifying the likelihood, but then you essentially have
> to rewrite fitdistr().)
>
> >
> > Att,
> >
> > Vanúcia Schumacher
> > Curso de graduação em meteorologia - UFPEL
> > Bolsista do Programa de Educação Tutorial - PET
> >
> >
> > > Subject: Re: [R] help error: In dweibull(x, shape, scale, log) : NaNs
> > > produzidos
> > > From: pda...@gmail.com
> > > Date: Tue, 21 Feb 2012 17:43:07 +0100
> > > CC: vanucia-schumac...@hotmail.com; r-help@r-project.org
> > > To: dwinsem...@comcast.net
> > >
> > >
> > > On Feb 21, 2012, at 16:36 , David Winsemius wrote:
> > >
> > > > It suggests you managed to send negative or infinite numbers to
> > > > dweibull, a distribution which only supports values when given
> > > > positive, finite numbers. Look at your data more closely.
> > >
> > > Zeros are a common cause, too. For a < 1 (the shape parameter), the
> > > Weibull density has a singularity at zero, and fitdistr() is not tolerant
> > > of observations rounded to zero in such cases.
> > >
> > > --
> > > Peter Dalgaard, Professor
> > > Center for Statistics, Copenhagen Business School
> > > Solbjerg Plads 3, 2000 Frederiksberg, Denmark
> > > Phone: (+45)38153501
> > > Email: pd....@cbs.dk Priv: pda...@gmail.com
> > >
>
> --
> Peter Dalgaard, Professor
> Center for Statistics, Copenhagen Business School
> Solbjerg Plads 3, 2000 Frederiksberg, Denmark
> Phone: (+45)38153501
> Email: pd....@cbs.dk Priv: pda...@gmail.com
>
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