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Exact(13)
This leads to equal c2 predictions for strong versus weak items, even though the average hit rate of strong items (strong items ranked first) would be greater than the average hit rate of weak items.
According to a continuous model, however, strong items, on average, have a greater strength than weak items.
In this paper, we assume that the population of items is composed of two ordered subpopulations and the elimination of weak items by using environmental shocks is considered.
Experiment 2 was our first foray into better approximating an eyewitness situation and the mismatch of faces from study to test mitigated the c2 differences between strong and weak items.
Using factor analysis to support the construct validity, and removing weak items, the original 60 caring items were reduced to a 31 item global caring scale which revealed the sub-scales: 'caring communication'; 'caring involvement'caringing advocacy'; and 'learning to care'.
On weak items the same holds with negative scores.
Similar(47)
Weak item-scale convergent and discriminant validity were shown for the symptom scale.
Initially, the test consisted of 12 items, but one item was deleted due to weak item total correlation (0.29).
However, as part of the larger PhD study (Tomlin 2014), item-total correlations were performed, and items with weak item-total correlations (r < 0.3) were removed.
The EFA found four items (5, 11, 15, 16) with weak item-total correlations (below 0.20) and these items were dropped to create 16-item scoring of the scale.
Item 49 ("Many people are very "fake" and do not behave the way they really are") showed a weak item total correlation with rit = .11 in the subscale-referred analysis and rit = .18 in the scale-referred analysis in the school sample, implying that this item has too little in common with the variance of the whole scale and the other items.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com