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- Guttman_scale abstract "In statistical surveys conducted by means of structured interviews or questionnaires, a subset of the survey items having binary (e.g., YES or NO) answers forms a Guttman scale (named after Louis Guttman) if they can be ranked in some order so that, for a rational respondent, the response pattern can be captured by a single index on that ordered scale. In other words, on a Guttman scale, items are arranged in an order so that an individual who agrees with a particular item also agrees with items of lower rank-order. For example, a series of items could be (1) "I am willing to be near ice cream"; (2) "I am willing to smell ice cream"; (3) "I am willing to eat ice cream"; and (4) "I love to eat ice cream". Agreement with any one item implies agreement with the lower-order items. This contrasts with topics studied using a Likert scale or a Thurstone scale. The concept of Guttman scale likewise applies to series of items in other kinds of tests, such as achievement tests, that have binary outcomes. For example, a test of math achievement might order questions based on their difficulty and instruct the examinee to begin in the middle. The assumption is if the examinee can successfully answer items of that difficulty (e.g., summing two 3-digit numbers), s/he would be able to answer the earlier questions (e.g., summing two 2-digit numbers). Some achievement tests are organized in a Guttman scale to reduce the duration of the test. By designing surveys and tests such that they contain Guttman scales, researchers can simplify the analysis of the outcome of surveys and increase the robustness. Guttman scales also make it possible to detect and discard randomized answer patterns, as may be given by uncooperative respondents.A hypothetical, perfect Guttman scale consists of a unidimensional set of items that are ranked in order of difficulty from least extreme to most extreme position. For example, a person scoring a "7" on a ten item Guttman scale, will agree with items 1-7 and disagree with items 8,9,10. An important property of Guttman's model is that a person's entire set of responses to all items can be predicted from their cumulative score because the model is deterministic.A well-known example of a Guttman scale is the Bogardus Social Distance Scale.Another example is the original Beaufort wind force scale, assigning a single number to observed conditions of the sea surface ("Flat", ..., "Small waves", ..., "Sea heaps up and foam begins to streak", ...), which was in fact a Guttman scale. The observation "Flat = YES" implies "Small waves = NO".".
- Guttman_scale wikiPageExternalLink scalgutt.htm.
- Guttman_scale wikiPageExternalLink Homogeneity.htm.
- Guttman_scale wikiPageExternalLink Order%20Analysis.htm.
- Guttman_scale wikiPageID "1058531".
- Guttman_scale wikiPageRevisionID "600839810".
- Guttman_scale hasPhotoCollection Guttman_scale.
- Guttman_scale subject Category:Market_research.
- Guttman_scale subject Category:Psychometrics.
- Guttman_scale subject Category:Questionnaire_construction.
- Guttman_scale comment "In statistical surveys conducted by means of structured interviews or questionnaires, a subset of the survey items having binary (e.g., YES or NO) answers forms a Guttman scale (named after Louis Guttman) if they can be ranked in some order so that, for a rational respondent, the response pattern can be captured by a single index on that ordered scale.".
- Guttman_scale label "Guttman scale".
- Guttman_scale label "Guttman-Skala".
- Guttman_scale label "Guttmanschaal".
- Guttman_scale label "Skala Guttmana".
- Guttman_scale label "累積量表".
- Guttman_scale sameAs Guttman-Skala.
- Guttman_scale sameAs Guttman_eskala.
- Guttman_scale sameAs Guttmanschaal.
- Guttman_scale sameAs Skala_Guttmana.
- Guttman_scale sameAs m.042cfq.
- Guttman_scale sameAs Q1304639.
- Guttman_scale sameAs Q1304639.
- Guttman_scale wasDerivedFrom Guttman_scale?oldid=600839810.
- Guttman_scale isPrimaryTopicOf Guttman_scale.