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Note: Bold number indicates salient factor loading (≥.32); h 2 indicates item communalities; SHI: Sleep Hygiene Index.
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The green text indicates items ranked higher than in other accounts.
In Figures 1, 2, 3, 4 and 5 the red text indicates items ranked lower than in other accounts.
Rasch item reliability coefficients were high, indicating item difficulty estimates were scattered along a continuum.
DIF does not necessarily indicate item bias or flaws with the item.
Nine items were highly correlated (r ≥ 0.75) with other items indicating item redundancy.
Additionally, the inter-item correlation matrix was observed to detect very high correlation indicating item redundancy.
Each item included a rating scale to indicate item importance for a person's QoL.
Deviation from the recommended [ 35] range of -2.5 to +2.5, indicating item misfit, are bold.
Some of the items showed fairly high correlation, and a few correlation coefficients exceeded 0.9, which may indicate item redundancy.
A third limitation, the Cronbach's Alpha value surpassed the cut-off value of 0.90 indicating item redundancy.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com