erf function

Plot empirical response function

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

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.

Returns

None

Examples

erf(Scored, 3)

Author(s)

Ivailo Partchev