Description Usage Arguments Details Value Author(s) Examples

Second partial derivative of the log partial likelihood with respect to the linear predictor.

1 | ```
ddlpl(b, X, Ri, Ci)
``` |

`b` |
vector of regression coefficients. |

`X` |
design matrix. |

`Ri` |
list of length |

`Ci` |
list of length |

This function calculates the second partial derivative of the log partial likelihood.

A vector with second gradients.

Holger Reulen

1 | ```
## Not run: ddlpl(b, X, Ri, Ci)
``` |

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