d_phi: Partial derivatives for mean impact equation.

In regDIF: Regularized Differential Item Functioning

Partial derivatives for mean impact equation.

Description

Partial derivatives for mean impact equation.

Usage

d_phi(
  p_impact,
  etable,
  theta,
  mean_predictors,
  var_predictors,
  cov,
  samp_size,
  num_items,
  num_quad
)

Arguments

p_impact	Vector of impact parameters.
etable	E-table for impact.
theta	Matrix of adaptive theta values.
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.
num_quad	Number of quadrature points used for approximating the latent variable.

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.