erf {irtoys}

Plot empirical response function

Description

Produces a plot of the empirical response function (proportion of correct responses at each possible sum score).

Usage

erf(resp, item)

Arguments

resp

A matrix of binary responses to a test, with persons as rows and items as columns.

item

The item (column number in resp) to plot.

Value

None

Author(s)

Ivailo Partchev

Examples

erf(Scored, 3)