estimate_helpers function

Helper functions of Model Estimation

miscellaneous helper functions for estimating IRT models

estimate_nr_iteration updates the parameters using the newton-raphson method

estimate_nr_iteration(param, free, dv, h_max, lr, bound)

model_polytomous_3dindex(u)

model_polytomous_3dresponse(u)

Arguments

• param: the parameter being estimated
• free: TRUE to freely estimate specific parameters
• dv: the first and second derivatives
• h_max: the maximum value of h
• lr: the learning rate
• bound: the lower and upper bounds of the parameter
• u: the observed response, 2d matrix, values start from 0