d_phi_proxy: Partial derivatives for mean impact equation using proxy...

In regDIF: Regularized Differential Item Functioning

Partial derivatives for mean impact equation using proxy data.

Description

Partial derivatives for mean impact equation using proxy data.

Usage

d_phi_proxy(
  p_impact,
  prox_data,
  mean_predictors,
  var_predictors,
  cov,
  samp_size,
  num_items
)

Arguments

p_impact	Vector of impact parameters.
prox_data	Matrix of observed proxy scores.
mean_predictors	Possibly different matrix of predictors for the mean impact equation.
var_predictors	Possibly different matrix of predictors for the variance impact equation.
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 impact equation (to use with coordinate descent and univariate Newton-Raphson)

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