Estimating the variance of the first derivative of log-likelihood function

1 |

`x` |
a fitted model object. Currently only implemented for |

`which` |
which penalty parameter(s)? |

`...` |
arguments passed to the |

See reference below

A

*k x k*

covariance matrix of first derivative of log-likelihood function

Zhu Wang <zwang@connecticutchildrens.org>

Zhu Wang, Shuangge Ma and Ching-Yun Wang (2015) *Variable selection for zero-inflated and overdispersed data with application to health care demand in Germany*, *Biometrical Journal*. 57(5):867-84.

`sandwichReg`

, `breadReg`

, `estfunReg`

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