regDIF (version 1.1.1)

d_gaussian_itemblock_proxy: Partial derivatives for continuous items using proxy data.

Description

Partial derivatives for continuous items using proxy data.

Usage

d_gaussian_itemblock_proxy(
  p_item,
  prox_data,
  responses_item,
  pred_data,
  samp_size,
  num_items,
  num_quad,
  num_predictors
)

Value

a "list" of first and second partial derivatives for mean value of Gaussian item likelihood (to use with coordinate descent and univariate Newton-Raphson)

Arguments

p_item

Vector of item parameters.

prox_data

Vector of observed proxy scores.

responses_item

Vector of item responses.

pred_data

Matrix or dataframe of DIF and/or impact predictors.

samp_size

Sample size in dataset.

num_items

Number of items in dataset.

num_quad

Number of quadrature points used for approximating the latent variable.

num_predictors

Number of predictors in dataset.