create_E_MFI {cat.dt}

R Documentation

Fisher Information of every item for an specified node

Description

Computes a vector of the Fisher Information of every item allocated to the specified level node in the CAT decision tree. Every FI is computed using the estimated ability level in the specified node

Usage

create_E_MFI(bank, theta_est, nres, C)

Arguments

bank	matrix of the item bank. Rows represent items, and columns represent parameters. If the model is "GRM", the first column represents the alpha parameters and the next columns represent the beta parameters. If the model is "NRM", odd columns represent the alpha parameters and even columns represent beta parameters
theta_est	estimated ability level
nres	vector of number of possible responses for every item
C	vector of item capacities

Value

A vector of all item Fisher Information for the specified node

Author(s)

Javier Rodríguez-Cuadrado

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