rcrtan (version 0.1.1)

subkoviak: Calculate Subkoviak's (1988) single administration consistency indices

Description

Calculate Subkoviak's (1988) single administration consistency indices

Usage

subkoviak(data, items, raw_cut_score, total = NULL, look_up = FALSE)

Arguments

data

A data frame of dichotomously scored test items

items

Raw column indices representing the test items or number of items on the test (see Details)

raw_cut_score

The raw cut-score for the test

total

Total score column of the test (see Details)

look_up

If TRUE, the agreement and kappa tables from Subkoviak (1988) are returned with the results

Value

The z_cut score and the rounded z_cut_rounded score for the test

The estimated alpha coefficient. K-R21 is used when there is no item-level information. Otherwise, K-R20 is used.

The rounded values for the agree_coef (agreement) and kappa_coef (kappa) coefficients from Subkoviak's (1988) tables

Details

When the item-level information is available, Kuder-Richardson 20 is used as an estimate of alpha. If only the total scores on the test are available and the number of items is known, Kuder-Richardson 21 is used as an estimate of alpha.

Examples

# NOT RUN {
subkoviak(data = bh_depend, items = 2:31, raw_cut_score = 21)
# }