LatentREGpp (version 0.2.2)

envelope_itemf: Confidence Envelops for an item

Description

Graphs confidence bands of an item, to evaluate the goodness of fit of the model.

Usage

envelope_itemf(item, numboot = 100, alpha = 0.05, item.fit, data, seed = 5000L)

Arguments

item

a number indicating the item to be evaluated.

numboot

number of iterations bootstrap, used to plot the envelopes. By default 100.

alpha

level of significance to plot the envelopes. By default 0.05.

item.fit

object LatentREGpp::itemfit() type.

data

a dataframe or a matrix with the test data.

seed

the seed to fix the random sample. By default 500L.

Value

plot with the envelopes and the caracteristic curve of the item.

References

David Thissen, Howard Wainer D. (1990). Confidence Envelopes for Item Response Theory. Journal of Educational Statistics, Vol 15, No 2, 113-128.

See Also

orlando_itemf, z3_itemf