There's at least one package that can do zero-inflated gamma regression
(Rfast2::zigamma). I'm not sure it's ML, though.
On Thu, Jan 19, 2023 at 10:17 AM Jeff Newmiller
wrote:
> Beware of adding a constant... the magnitude of the constant used can have
> an outsized impact on the answer
Another situation for the presence of 0 is about dosage when
concentration is below the detection limit. It is not necessary to
discretize the data. We propose a method here:
Salvat-Leal I, Cortés-Gómez AA, Romero D, Girondot M (2022) New method
for imputation of unquantifiable values using
Beware of adding a constant... the magnitude of the constant used can have an
outsized impact on the answer obtained. See e.g.
https://gist.github.com/jdnewmil/99301a88de702ad2fcbaef33326b08b4
On January 19, 2023 3:49:29 AM PST, peter dalgaard wrote:
>Not necessarily homework, Bert. There's a
Not necessarily homework, Bert. There's a generic issue with MLE and rounded
data, in that gamma densities may be 0 at the boundary but small numbers are
represented as 0, making the log-likelihood -Inf.
The cleanest way out is to switch to a discretized distribution in the
likelihood, so
Is this homework? This list has a no-homework policy.
-- Bert
On Tue, Jan 10, 2023 at 8:13 AM Nyasha wrote:
>
> Please how can one go about this one? I don't know how to go about it.
>
> [[alternative HTML version deleted]]
>
> __
>
Please how can one go about this one? I don't know how to go about it.
[[alternative HTML version deleted]]
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Greetings, all
I am having difficulty getting the fitdistr() function to return without
an error on my data. Specifically, what I'm trying to do is get a
parameter estimation for fracture intensity data in a well / borehole.
Lower bound is 0 (no fractures in the selected data interval), and upper
Fox, Aaron wrote:
Greetings, all
I am having difficulty getting the fitdistr() function to return without
an error on my data. Specifically, what I'm trying to do is get a
parameter estimation for fracture intensity data in a well / borehole.
Lower bound is 0 (no fractures in the selected data
Fox, Aaron Afox at golder.com writes:
Greetings, all
I am having difficulty getting the fitdistr() function to return without
an error on my data. Specifically, what I'm trying to do is get a
parameter estimation for fracture intensity data in a well / borehole.
Lower bound is 0 (no
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