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A data.frame containing 209 calibrated items with different categorical and metric properties, comparable to an item pool from a large-scale assessment.

Usage

items_lsa

Format

A data.frame .

testlet

Testlet identifier (items in the same testlet share a common stimulus.

item

Item identifier.

level

Competence level.

format

Item format.

frequency

Solution frequency.

infit

Item infit.

time

Average response time in seconds.

anchor

Is the item an anchor item?