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Table 9 shows the mean numbers of performing and discriminating options per item.
Analysis was also conducted of the effect which varying the number of options per item had as between the answers offered in the short answer test against the options selected in the three multiple choice tests.
Each reading test featured nine passages with a total of 122 items including multiple choice, a limited number of multiple-response multiple-choice items (selected response items in which test takers must select two or more correct options per item), and one categorization item.
The first version contained four options per item, one correct option and three incorrect options.
The first form featured four response options per item.
The second version contained three options per item, with one less incorrect option.
The average number of non-functioning options per item in the four-option test form was 1.18.
Another point still pending concerned the appropriate number of response options per item.
Self-completion and interview versions of ASCOT have four response options per item.
The item pool originally contained four response options, but a graphical, non-parametric IRT analysis showed that the number of response options per item should be reduced.
To analyse the SSEAS, with 5 answer options per item, the polytomous Rasch Rating Scale Model (RRSM) was used.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com