[R] help error: In dweibull(x, shape, scale, log) : NaNs produzidos

[peter dalgaard]

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.mes at cbs.dk  Priv: PDalgd at gmail.com