DD_weight function

One iteration to run Newton Raphson to get Ds-optimal weights

This is a sub-part of running Newton Raphon method to search Ds-optimal weights for the given design points. This is function probvides the obtained Ds-optimal weights after one iteration of Newton Raphson method.

DD_weight(W, T, X, d, I4, I5, order)

Arguments

• W: A numeric vector. The first K-1 weights for a given design
• T: A numeric vector. Model parameter values
• X: A numeric vector. K dose levels for a given design
• d: Numeric. Step adjustment
• I4: A numeric matrix. Information matrix for the 4PL model
• I5: A numeric matrix. Information matrix for the 5PL model
• order: Numeric. The number of model paraemters