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ICC-curves of Guttman and Thurstone items

“Kids should learn French”. “Some classes is fine”. “Kids should not learn French”. -. +. “Kids don’t need to learn French”. “some classes is too few”. ICC-curves of Guttman and Thurstone items. P(Agree). 1. Guttman “Children should get classes on the French language”. Thurstone

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ICC-curves of Guttman and Thurstone items

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  1. “Kids should learn French” “Some classes is fine” “Kids should not learn French” - + “Kids don’t need to learn French” “some classes is too few” ICC-curves of Guttman and Thurstone items P(Agree) 1 Guttman “Children should get classes on the French language” Thurstone “Children should get but a few classes on the French language” Attitude towards classes on French in Primary school

  2. Writing Thurstone items • Take care if you can expect the item to have the “typical” Thurstone ICC-profile • Author of items probably has her own view on the topic which complicates writing items that cover a “distant” opinion (items must word true opinions). A qualitative pilotstudy can be helpful to learn to know such “extreme” opinions • The entire domain (scope) of the attitude must be covered by (some) items, if not there is a risk to obtain an incomplete scale. Therefor the original set of items needs to be large and comprehensive • Factual items are not useful aim at an attitude of opinion.

  3. 0 1 2 3 4 5 6 7 8 9 10 0.3 1 2 2.7 3.5 4 5 6.1 6.8 7.7 9.5 ICC-curves in Thurstone scales P(Agree) 1 1 Attitude

  4. Incomplete Thurstone scale (too few and not well-callibrated items) 1 P(Agree) 1 0.3 1 2.7 3.5 6.1 6.8 9.5 Attitude Participant with an attitude that corresponds to an uncovered range will disagree with all items and consequently get no score …

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