d_categorical: Partial derivatives for ordinal items.

In wbelzak/regDIF: Regularized Differential Item Functioning

Partial derivatives for ordinal items.

Description

Partial derivatives for ordinal items.

Usage

d_categorical(
  parm,
  p_item,
  etable_item,
  theta,
  pred_data,
  thr,
  cov,
  samp_size,
  num_responses_item,
  num_items,
  num_quad
)

Arguments

parm	Item parameter being maximized.
p_item	Vector of item parameters.
etable_item	E-table for impact.
theta	Matrix of adaptive theta values.
pred_data	Matrix or dataframe of DIF and/or impact predictors.
thr	Threshold value being maximized.
cov	Covariate being maximized.
samp_size	Sample size in dataset.
num_responses_item	Number of responses for item.
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 categorical item likelihood (to use with coordinate descent and univariate Newton-Raphson)

wbelzak/regDIF documentation built on Jan. 5, 2023, 9:53 p.m.