Computes the derivative of the part of the loglikelihood function relevant to optimizing kappa for step 2. Instead of performing constrained optimization on kappa directly, we optimize the log of kappa in an unconstrained fashion.
the 1xD matrix log(kappa - model\$MIN_KAPPA)
list containing all the parameters to be optimized
The negative derivative of the part of the loglikelihood function relevant to kappa with respect to log kappa (a Dx1 matrix).
Gerald Quon, Catalina Anghel, Francis Nguyen
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