theta_ll: theta_ll

In conquestr: An R Package to Extend 'ACER ConQuest'

theta_ll

Description

returns the log of the likelihood of theta, given a vector of item responses, item parameters. Note that this is the simple ll - it is the continuing product of the response probabilities. It includes a hack, that will nudge the raw response to the first item to adjust for zeros and perfects. This should be updated to work with adjusted raw scores instead...

Usage

theta_ll(theta, responses, itemParams)

Arguments

theta	a scalar value of theta.
responses	a vector of item responses (used in a call to pX).
params	a list of item designs (each used in a call to simplef). Must be of same length as responses.

Value

a double, the log of the likelihood at theta..

conquestr documentation built on March 31, 2023, 6:02 p.m.