isop.calc1set {ISOP}R Documentation

ISOP model for one set of items

Description

The function calculates nonparametric indices for testing the validity of an ISOP-Model, suggested by Scheiblechner, for a given set of items.

Usage

isop.calc1set(raw, verbose = TRUE)

Arguments

raw

The data ISOP should be applied on

verbose

Print information about progress

Value

ns, nd, nt, nss, ndd, nsd

Frequencies of concordant, discordant and tied vectors

ps, pd, pt, pss, pdd, psd

Probabilities of concordant, discordant and tied vectors

predictability

Multivariate index of ordinal association. Varies between -1 and +1. Does not include ties.

stddev

Standard devation of predictability

isotonicity

Nonparametric measure of positive diagonalization of an ordered contingency table. Varies between 0 and +1. Includes ties.

compatibility

Number of pairs concordant or tied

n

Number of response vectors

z

z-value of normal distribution

stderr

Standard error of predictability

ubas

Upper bound of asymptotic

Author(s)

Stefan Nachtnebel

References

Hartmann Scheiblechner (2003) Nonparametric IRT: Testing the bi-isotonicity of isotonic probabilistic models (ISOP) Psychometrika, 68, 1, 79–96

See Also

isop.calc2set


[Package ISOP version 1.0 Index]