contentValidity - Content Validity Indices for Instrument Development
Computes content validity indices commonly used in
instrument development and questionnaire validation, including
the Item-level Content Validity Index (I-CVI), Scale-level
Content Validity Index (S-CVI), modified kappa adjusted for
chance agreement, Aiken's V, and Lawshe's Content Validity
Ratio (CVR). Methods follow Lynn (1986)
<doi:10.1097/00006199-198611000-00017>, Polit and Beck (2006)
<doi:10.1002/nur.20147>, Aiken (1985)
<doi:10.1177/0013164485451012>, and Lawshe (1975)
<doi:10.1111/j.1744-6570.1975.tb01393.x>.
