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The third section compares the statistical characteristics of the mixed option version against the fixed option versions of the test.
This server computes structural alignments between two protein structures using the DaliLite-pairwise option (version 3.1) [ 80].
If both options were available, participants were more likely to choose Option 2, which was always the most environmentally friendly option (Version 1: χ (1) = 63.09, p <.001; Version 2: χ (1) = 33.92, p <.001; Version 3: χ (1) = 24.92, p <.001).
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They also found no significant differences in the discrimination coefficients of the different option versions, but for two of the three tests used they found the 3-option version to be significantly more reliable than the 4-option version, while for the third test they found the 5-option test to be more reliable than the 4-option test.
They found significant differences in difficulty between 3- and 4-, and between 3- and 5-option versions of the three tests adapted to produce the different option versions, but found no differences between the 4- and 5-option versions.
A three-option version would, however, pose the risk that the respondent does not feel there are enough or sufficiently nuanced response options to provide an adequate answer.
In relation to the focus of this review part on number of options, it appeared that compared to the 6-option version, the 8-option version resulted in a higher proportion of cases of "mismatch" between learners' knowledge assessed through the paper test and the interview.
The authors thus concluded that "different WAF versions may benefit from different distractor types, with Meaning-based distractors being better for the shorter 6-option version, but with No-relationship distractors being better for the 8-option version," and "formal distracters should be less frequently used" (p. 121).
Using a group of 1000 Israeli subjects they found that the 2-option version of the test was easiest and least reliable with the difficulty of the formats increasing with the number of options, and concluded that the optimum number of options was greater than three.
Most rated the video strongly in favor of screening (5-option version 84% vs. 2-option version 73%) or somewhat in favor of screening (5-option version 12% vs. 2-option version 19%).
They were randomized to view one of two decision aids in the lab: a 5-option version or a 2-option version.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com