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We were unable to explain items with low factor coefficients and communalities.
Researchers should be aware of these issues and aim to minimize their occurrence, for example by using face-to-face interviews in studies with older adults, in which interviewers have the availability to explain items more extensively.
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This is how I'd explain item #3 on my list — the replacing of the word "nigger" with the word "slave" in an edition of Huck Finn (it happened last week, but the discussion is still at a fever pitch).
Here, we will explain item iii) decision drivers: the form listed nine drivers as predefined options for the participants, but it was also possible to write down a new one.
The following analysis presents the contribution of each factor toward explaining item difficulty.
It also explains item analysis such as assessing item difficulty, item discrimination, and differential item functioning, and describes test equating and scaling, along with test reliability, the standard errors of measurement, and test validity.
A three-way ANOVA was performed to determine if a three-way interaction effect exists among RPD, SIM, and DWD for explaining item difficulty, as well as to understand which factor contributes the most to item difficulty.
Table 2 shows the item loadings, variance explained, item-total correlations and reliabilities for these four subscales.
The first factor explaining item variance in the Core FertiQoL was the Emotional subscale explaining 31.8% (Online) and 37.8% (Clinic) of the item variability.
Table 2 shows the item loadings, variance explained, item-total correlations by subscales, communality values and reliabilities for these five subscales.
16 In the fifth step, a principal component analysis (PCA) was performed to identify the potential factors explaining item difficulty hierarchy variations observed across the diagnostic groups.
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