plotINFO | R Documentation |
'eRm'
objects
Calculates and plots the individual item-category information (type='category'), item information (type='item') or test/scale information (i.e., summed item information, type='scale' or 'test') ) as defined by Samejima (1969)
plotINFO(ermobject, type = "both", theta = seq(-6, 6, length.out = 1001L),
legpos = "topright", ...)
ermobject |
An object of class |
type |
A string denoting the type of information to be
plotted. Currently supports |
theta |
Supporting or sampling points on the latent trait. |
legpos |
Defines the positioning of the legend, as in |
... |
Further arguments.
|
Thomas Rusch
Samejima, F. (1969) Estimation of latent ability using a response pattern of graded scores. Psychometric Monographs, 17.
The function to calculate the item or test information, item_info
and test_info
.
res <- PCM(pcmdat)
plotINFO(res)
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