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Rasch item reliability coefficients were high, indicating item difficulty estimates were scattered along a continuum.
Additionally, the inter-item correlation matrix was observed to detect very high correlation indicating item redundancy.
Nine items were highly correlated (r ≥ 0.75) with other items indicating item redundancy.
Deviation from the recommended [ 35] range of -2.5 to +2.5, indicating item misfit, are bold.
A third limitation, the Cronbach's Alpha value surpassed the cut-off value of 0.90 indicating item redundancy.
A higher alpha was acceptable because for shorter scales (such as CDIS) all items may be clinically informative rather than indicating item redundancy.
Similar(54)
"This is my for-profit environmental venture," he said with a laugh, indicating items in his one-bedroom Greenwich Village apartment from Danny Seo Home, a collection he hopes to bring to market: home furnishings embodying his look-good, do-good aesthetic.
DIF does not necessarily indicate item bias or flaws with the item.
Each item included a rating scale to indicate item importance for a person's QoL.
Some of the items showed fairly high correlation, and a few correlation coefficients exceeded 0.9, which may indicate item redundancy.
Note: Bold number indicates salient factor loading (≥.32); h 2 indicates item communalities; SHI: Sleep Hygiene Index.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com