smalld1 {Opt5PL}

Sub-function of the function D_weight_1

Description

This computes the first derivative of the D-optimality criterion with respect to the model parameters for a specified model.

Usage

smalld1(T, x, xl, inv, order)

Arguments

T

A numeric vector. Model parameter values

x

A numeric. ith dose level

xl

A numeric. last dose level

inv

A numeric matrix. Inverse infromation matrix

order

numeric. The number of model paraemters: 3, 4, 5 for the 3, 4, 5PL models respectively