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Second-order dispersion derivatives for a family, or NULL

Source: R/family_dispersion.R
dot-family_dphi2.Rd

Second-order dispersion derivatives for a family, or NULL

Usage

.family_dphi2(family)

Arguments

family

Family name, as registered in .FAMILY_OPS.

Value

A list with dloglik2, dscore2, dweight2 and dweight_deta, or NULL when the family's phi Hessian has not been derived. NULL is a refusal, not a fixed-value fallback: it hands the phi Hessian to the differencing stencil rather than reporting an inexact closed form.