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Every property indicated a different score in each item, while the music recommendation property of the robot showed better results for the overall items.
When the treatment-specific items preceded the overall items, the mean of those items were correlated.67 with the mean of the overall items, whereas when the treatment-specific items followed the overall items the means were correlated.75 with overall.
The overall items fit residual SD was acceptable and no local dependency or significant DIF by age, cancer type, and sex were found.
Although the fit residual (2.66) for item 1 ' At the moment I take one day at a time' was marginally above the recommended cut point (2.5) it was retained, as the overall items fit residual SD was satisfactory.
Although for only a small subset of the overall items, this study provides the first known comparison between reliability estimates of the same items on tools tested in different countries.
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The previous research question asked the impact of each factor on the overall item difficulty.
The overall item score correlations between three raters were excellent (r = 0.80 to 0.94).
The median item-total score correlation was.41, and the overall item-total score correlations were statistically significant (p < .01).01
With removal of six misfitting items, the overall item fit residual standard deviation (SD) was reduced to 1.8.
The overall item score reached 4.1 in the second round, meeting our criteria for completion of this Delphi procedure.
From a theoretical perspective, the addition of distractor options which discriminate appropriately (negatively) should improve the overall item discrimination [ 18].
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com