irt (version 0.1.1)

resp_lik: 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 Item
resp_lik(ip, resp, theta)
# S4 method for Itempool
resp_lik(ip, resp, theta)
# S4 method for 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)

Examples

# NOT RUN {
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)

# }