CVratio: Content Validity Ratio

Description Usage Arguments Details Value Note Author(s) References Examples

Description

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

Usage

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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 tom.fletcher.mp7e@statefarm.com

References

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

Examples

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# 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 May 2, 2019, 9:38 a.m.