test_info {eRm} R Documentation

## Calculate Test Information For eRm objects

### Description

Calculates the information of a test or a scale as the sum of Samejima's (1969) information for all items.

### Usage

test_info(ermobject, theta=seq(-5,5,0.01))


### Arguments

 ermobject An object of class 'eRm'. theta Supporting or sampling points on the latent trait.

### Details

The function test_info calculates the test or scale information of the whole set of items in the 'eRm' object.

### Value

Returns the vector of test information for all values of theta.

Thomas Rusch

### References

Samejima, F. (1969) Estimation of latent ability using a response pattern of graded scores. Psychometric Monographs, 17.

The function to calculate the item information, item_info and the plot function plotINFO.
res <- PCM(pcmdat)