istudy: Scored Item Study

In talbano/epmr: Tools for Educational and Psychological Measurement

Scored Item Study

Description

Functions for estimating classical item analysis indices, including item difficulty (means and standard deviations by item), item discrimination (item-total and corrected item-total correlations), and alpha if item deleted. Descriptive statistics and reliability estimates are also returned at the scale level.

Usage

istudy(x, subset = 1:ncol(x), scores, use = "everything")

Arguments

x	matrix or data.frame of scored item responses.
subset	optional vector for selecting a subset of columns from x.
scores	optional vector of construct scores used to calculate item discrimination.
use	string for specifying how to handle incomplete cases

Value

Returns a list with three elements: item containing a data.frame of item analysis output, scale containing descriptives for the full scale, and reliability containing a vector of internal consistency reliability estimates.

talbano/epmr documentation built on Aug. 25, 2023, 1:35 p.m.