irt (version 0.1.1)

$,Itempool-method: Get slots of the an Item-class object.

Description

Get slots of the an Item-class object.

Usage

# S4 method for Itempool
$(x, name)

Arguments

x

An Itempool-class object from which to extract element(s) or in which to replace element(s).

name

Name of the parameter. Available values:

'id'

Extract id's of all items and testlets. This will not extract the id's of items within the testlet.

'content'

Extract content's of all items and testlets. This will not extract the content's of items within the testlet.

'model'

Extract model's of all items and testlets. This will not extract the model's of items within the testlet.

'misc'

Extract misc parameters of all items and testlets. This will not extract the misc parameters of items within the testlet.

'item_list'

Extract individual elements of item pool. If there are testlets in the item pool, a testlet will be an item of the resulting list. If individual items within the testlet is desired to be elements of the list, then use $items.

'items'

Extract individual items within the item pool. If there are testlets in the item pool individual elements of the testlet will be extracted. Resulting list will only consist of Item-class objects.

'parameters'

Extract parameters's of all items and testlets. This will not extract the parameters's of items within the testlet.

'se_parameters'

Extract se_parameters's of all items and testlets. This will not extract the se_parameters's of items within the testlet.

'n'

Return a list with three objects: elements the number of standalone items and testlets. testlets the number of Testlet objects. items the sum of the number of items within testlets and standalone items.

'max_score'

Returns the maximum possible raw score of the item pool.

'resp_id'

Extract id's of all standalone items and items within the testlets. It will not return testlet id's. This is mainly to get the id's of items which has a response.

'resp_content'

Extract content's of all standalone items and items within the testlets. It will not return testlet content's. This is mainly to get the content's of items which has a response.

'resp_model'

Extract model's of all standalone items and items within the testlets. It will not return testlet model's. This is mainly to get the model's of items which has a response.

'resp_misc'

Extract misc fields of all standalone items and items within the testlets. It will not return testlet misc fields.

'resp_max_score'

Extract the maximum score each standalone item can get.

Value

This operation will return a numeric object.

Details

I wrote this method with the help of: https://stackoverflow.com/a/10961998/2275286

Examples

# NOT RUN {
item1 <- methods::new("Item", model =  "3PL", id = 'item23',
                      content = 'Geometry',
                      parameters = list(b = 2, c = .12, a = 1.2, D = 1))
item1$a
item1$D
item1$model
item1$id
item1$content
# }