Computes Lawshe's CVR for determining whether items are essential or not.
Total number of Experts
Number of Experts indicating item 'essential'
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.
Content Validity Ratio
CVR = (Ne - N/2)/(N-1)
Thomas D. Fletcher firstname.lastname@example.org
Lawshe, C. H. (1975). A quantitative approach to content validity. Personnel Psychology, 28, 563-575.
# 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)
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