Description Usage Arguments Value Examples
This is an extension of the negbin
in the
mgcv
package, providing additional components related to the
negative binomial distribution with log link.
Compared to negbin
followed by a call to
fix.family.link
in the mgcv
package
this function provides a different implementation of linkinv
,
added a component initializers
of
initialization expressions, added the third and fourth order
cumulant functions cumulant3
and cumulant4
.
1 |
link |
The link funciton. Only |
overdisp |
A positive overdispersion parameter. This is the same as
|
A list of class c("fbrNBfamily", "family")
, containing
all components from the mgcv::negbin
followed by a call to
fix.family.link
with the following additional components:
A function setting the overdispersion parameter to a
specified value. The input argument to this function is 1/overdisp
.
A function returning the third cumulant of the distribution.
Input arguments are the mean mu
and variance var
.
A function returning the fourth cumulant of the distribution.
Input arguments are the mean mu
and variance var
.
A list of expressions that can be used to provide
starting values for iterative fitting. See the initialize
component
of the result from family
.
1 | negbin('log', 1)
|
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