Confronta i metodi

	Rapporto di Validità di Contenuto	Effetto pavimento e soffitto
Campo	Psicometria	Psicometria
Famiglia	Process / pipeline	Process / pipeline
Anno di origine	1975	2000
Ideatore	Charles H. Lawshe	Classical psychometrics
Tipo	Expert panel content validity assessment	Measurement validity assessment
Fonte seminale	Lawshe, C. H. (1975). A quantitative approach to content validity. Personnel Psychology, 28(4), 563-575.	McHorney, C. A. (2000). Ten recommendations for measuring health status. Health-Related Quality of Life Outcomes, 2(1), 1-5.
Alias	CVR, Content validity index, Expert judgment content validity, Lawshe CVR	Floor effect, Ceiling effect, Psychometric floor effect, Measurement floor
Correlati	4	4
Sintesi	The Content Validity Ratio (CVR) is a quantitative method developed by Charles Lawshe in 1975 for evaluating the extent to which items in a measurement instrument are relevant and representative of a target construct. The method aggregates expert panel judgments into a single validity coefficient for each item, enabling researchers to identify and retain only those items deemed essential by domain experts. CVR provides objective support for content validity claims during scale development.	Floor and ceiling effects are psychometric phenomena in which a disproportionately large proportion of respondents achieve the lowest (floor) or highest (ceiling) possible score on a measurement scale. These effects compromise scale reliability and responsiveness, limiting the instrument's ability to distinguish among respondents and detect meaningful change over time. Systematic assessment of floor and ceiling effects is essential for evaluating the psychometric adequacy of health-related quality-of-life scales, functional status measures, and other patient-reported outcomes.