scp: Plot observed and predicted scores against ability
In lebebr01/irtoys-2: Simple interface to the estimation and plotting of IRT models

Description Usage Arguments Value Author(s) See Also Examples

Produces a plot of IRT true scores (test response function at the estimated ability) with a confidence band (plus/minus standard error). The observed sum scores are shown in red.

1	scp(resp, ip, theta = NULL)

`resp`	A matrix of binary responses to a test, with persons as rows and items as columns.
`ip`	Item parameters: a matrix with one row per item, and three columns: [,1] item discrimination a, [,2] item difficulty b, and [,3] asymptote c.
`theta`	An object containing ability estimates, as output by function `mlebme` or `eap`. If `NULL`, MLE will be estimated from `resp` and `ip`.