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If deviation from unidimensionality is trivial, the number of person locations that differ between the two item sets is small.
Steiger's Z test revealed no differences in correlations to other measures between the two item 14 versions (all p > 0.117).
Psychometric equivalence of the two item versions was assessed using direct statistical comparison with the Wilcoxon Signed Ranks test and calculating the Spearman's rank correlation between the two item versions.
The median difference in scores between the two item 14 versions was 0, with the large majority of respondents (n = 99) giving the same answer to both item versions (i.e. no difference in scores).
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The only difference between the two items is that item 1 has a high space elasticity and item 2 has none ((beta _1 = 30%, beta _2 = 0%)).
In both our experiments, N2pc amplitude was reduced when the two items were close together as opposed to far apart which is consistent with the idea that the reduced N2pc amplitude reflects spatially-mediated competition between the two items.
We initially incorporated these items separately in the structural equation model but except for the path weights dividing almost equally between the two items, no difference was otherwise seen.
Furthermore, it is found that N270 is not elicited when the blank interval between the two items is 150 ms, but is elicited at longer intervals (e.g., 500 ms) [58] as well as in a classical Sternberg probe-matching working memory task [54], suggesting N270 has a functional bond with VWM.
Correlation between the two items is.547 (P < .001).001
10 Correlation between the two items on economic difficulties was 0.59, and the Cronbach α 0.74.
In the past, there was a link between the two items "formaldehyde emission" and "wood-based products".
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