item_pool-class {TestDesign}

Class 'item_pool': an item pool

Description

item_pool is an S4 class for representing an item pool.

Details

See item_pool-operators for object manipulation functions.

Slots

ni

the number of items in the pool.

max_cat

the maximum number of response categories across the pool.

index

the numeric index of each item.

id

the ID string of each item.

model

the item class name of each item. See item-classes.

NCAT

the number of response categories of each item.

parms

a list containing item class objects. See item-classes.

ipar

a matrix containing item parameters.

se

a matrix containing item parameter standard errors.

raw

the raw input data.frame used in loadItemPool to create this object.

raw_se

the raw input data.frame used in loadItemPool to create this object.

unique

whether item IDs must be unique for this object to be a valid object.