Icc curves of guttman and thurstone items
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“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

“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


Writing thurstone items
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.


Icc curves in thurstone scales

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


Incomplete thurstone scale too few and not well callibrated items
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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