d_sigma_gaussian_proxy: Partial derivatives for variance parameter of continuous...

In regDIF: Regularized Differential Item Functioning

Partial derivatives for variance parameter of continuous items with proxy data.

Description

Partial derivatives for variance parameter of continuous items with proxy data.

Usage

d_sigma_gaussian_proxy(
  parm,
  p_item,
  prox_data,
  responses_item,
  pred_data,
  cov,
  samp_size,
  num_items
)

Arguments

parm	Item parameter being maximized.
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.
cov	Covariate being maximized.
samp_size	Sample size in dataset.
num_items	Number of items in dataset.

Value

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

regDIF documentation built on May 29, 2024, 9:31 a.m.