resp_lik: Likelihood of a response string

In irt: Item Response Theory and Computerized Adaptive Testing Functions

Likelihood of a response string

Description

resp_lik returns the likelihood of a response string for given items and ability.

Usage

resp_lik(ip, resp, theta)

## S4 method for signature 'Item'
resp_lik(ip, resp, theta)

## S4 method for signature 'Itempool'
resp_lik(ip, resp, theta)

## S4 method for signature 'Testlet'
resp_lik(ip, resp, theta)

Arguments

ip	An Item-class, Itempool-class or a Testlet-class object.
resp	A vector of item responses.
theta	An vector containing ability parameters.

Value

A matrix of likelihood(s)

Author(s)

Emre Gonulates

Examples

item <- generate_item(model = "3PL")
theta <- rnorm(6)
resp <- sim_resp(ip = item, theta = theta, prop_missing = .1)
resp_lik(ip = item, resp = resp, theta = theta)

item <- generate_item(model = "GRM")
resp <- sim_resp(ip = item, theta = theta, prop_missing = .1)
resp_lik(ip = item, resp = resp, theta = theta)
ip <- generate_ip(model = "3PL")
theta <- rnorm(6)
resp <- sim_resp(ip = ip, theta = theta, prop_missing = .1)
resp_lik(ip = ip, resp = resp, theta = theta)

ip <- generate_ip(model = "GRM")
resp <- sim_resp(ip = ip, theta = theta, prop_missing = .1)
resp_lik(ip = ip, resp = resp, theta = theta)

irt documentation built on Nov. 10, 2022, 5:50 p.m.