Description Usage Arguments Details Value Author(s)

Specifies the information required to fit a negative binomial 1 (NB1) model.

1 |

`link` |
included for compatibility with |

`phi` |
the value of the scale parameter of the NB1 distribution (see
"Details"). This can be set to |

The NB1 distribution can be parameterised in
terms of a mean *μ* and scale parameter *φ* (the
`phi`

argument of this function), such that if
*Y \sim NB1(μ, φ)*, then *E(Y) = μ* and
*Var(Y) = (1+φ)μ*.

These can be related to the `size`

and `prob`

arguments
of the `NegBinomial`

functions by `size`

= *μ / φ*
and `prob`

= *1 / (1 + φ)*.

An object of class `"family"`

: see `family`

for
full details. Note that when the estimate of `phi`

is updated in
a model, this `family`

object must be reloaded using the new
estimate.

Mark W. Donoghoe markdonoghoe@gmail.com

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