CVratio: Content Validity Ratio

In psychometric: Applied Psychometric Theory

Content Validity Ratio

Description

Computes Lawshe's CVR for determining whether items are essential or not.

Usage

CVratio(NTOTAL, NESSENTIAL)

Arguments

NTOTAL	Total number of Experts
NESSENTIAL	Number of Experts indicating item 'essential'

Details

To determine content validity (in relation to job performance), a panel of subject matter experts will examine a set of items indicating whether the items are essential, useful, not necessary. The CVR is calculated to indicate whether the item is pertinent to the content validity.

CVR values range +1 to -1. Values closer to +1 indicated experts are in aggreement that the item is essential to content validity.

Value

Content Validity Ratio

Note

CVR = (Ne - N/2)/(N-1)

Author(s)

Thomas D. Fletcher [e-mail]

References

Lawshe, C. H. (1975). A quantitative approach to content validity. Personnel Psychology, 28, 563-575.

Examples

# Using 5 Expert panelists (SMEs)
# The ratings for an item is as follows:
# Rater1 = Essential
# Rater2 = Essential
# Rater3 = Essential
# Rater4 = Useful
# Rater5 = Not necessary
# # essential = 3
CVratio (5, 3)

psychometric documentation built on Nov. 6, 2023, 1:06 a.m.