bprobgHsBB: Internal Function
Description
It provides the log-likelihood, gradient and observed information matrix for
penalized or unpenalized maximum likelihood optimization. Possible bivariate distributions are
four Archimedean copulas with two parameters, namely the Clayton-Gumbel, Joe-Gumbel, Joe-Clayton and Joe-Frank. We refer to them
as BB1, BB6, BB7 and BB8, respectively. Their rotated versions are available as well.