Hi R lovers!
I'd like to know how to use the parameter 'start' in the function
fitdistr()
obviously I have to provide the initial value of the parameter to optimize
except in the case of a certain set of given distribution
Indeed according to the help file for fitdistr
" For the following named distributions, reasonable starting values
will be computed if `start' is omitted or only partially
specified: `cauchy', `gamma', `logistic', `negative binomial' (R
only, parametrized by `mu' and `size'), `t', `uniform', `weibull'. "
However I cannot fit an univariate distribution named 'test'
I get this:
>fitdistr(test,"lognormal")
Error in fitdistr(test, "lognormal") : `start' must be a named list
> fitdistr(test,"lognormal",start$meanlog=0,start$sdlog=1)
Error: syntax error
How I am supposed to type a value for start depending on the distribution
on which I am fitting my set
thanks
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