เปรียบเทียบวิธี

	Guttman Scale	อัตราส่วนความตรงเชิงเนื้อหา
สาขาวิชา	การวัดทางจิตวิทยา	การวัดทางจิตวิทยา
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	1944	1975
ผู้ริเริ่ม	Louis Guttman	Charles H. Lawshe
ประเภท	Cumulative unidimensional scaling methodology	Expert panel content validity assessment
แหล่งต้นตำรับ	Guttman, L. (1944). A basis for scaling qualitative data. American Sociological Review, 9(2), 139-150.	Lawshe, C. H. (1975). A quantitative approach to content validity. Personnel Psychology, 28(4), 563-575.
ชื่อเรียกอื่น	Cumulative scale, Scalogram analysis, Guttman scaling, Unidimensional cumulative scale	CVR, Content validity index, Expert judgment content validity, Lawshe CVR
ที่เกี่ยวข้อง	4	4
สรุป	Guttman scaling is a methodology for constructing unidimensional scales with a cumulative property, developed by Louis Guttman in 1944. The method assumes that items form a perfect or near-perfect hierarchy: if a respondent endorses a harder item, they must endorse all easier items below it. This creates a reproducible scale structure useful for measuring constructs with ordinal properties such as difficulty, intensity, or severity.	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.