tif_: Test information function

In UO-BRT/exirt: Analyze data from the Oregon Extended Assessment

Test information function

Description

Sums the item information for each theta value supplied to provide the overall information provided by the test for the given theta values supplied. Internally, the theta values are converted to RIT scores to make the output more directly interpretable.

Usage

tif_(id, name, theta = seq(-6, 6, 0.01))

Arguments

id	The data frame returned from get_item_diffs().
name	The name of the given test, e.g., "ELA_G8", "Math_G11".
theta	The person ability estimate. This is the theta estimate from get_person_estimates() (not the RIT score). Defaults to a sequence from -6 to 6 in increments of 0.01.

UO-BRT/exirt documentation built on Jan. 29, 2023, 8:51 a.m.