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After AFCs were done, to estimate parameters of items of scale by item response package theory (IRT), ltm (Rizopoulos, 2006) and Mokken (Van der Ark, 2007) were adopted.
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To date, most researchers rely on suicidal items of scales primarily designed to measure depression severity to capture suicidal ideation (SI).
(The factor loadings of the items of one scale were below 0.23 on the other scale).
Reliability indicates how well the individual items of a scale measure the underlying concept of the scale.
Items of the scale were rated on a 5-point Likert-type scale.
Because the items of each scale were strongly inter-correlated, regression models for the items of each scale were not attempted.
Scale scores were derived by computing the mean score on the items of the scale (Appendix Table 1).
The results showed an improvement in the inter-rater agreement of five out of 12 items of the scale.
Item analysis also revealed the overall psychometric adequacy of the items of the scale.
First, items of the scale are not specific, and may equally well measure worry, self-worth and distress.
To the extent that the researcher removes items of the scale, the Cronbach's alpha tends to decrease.
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CEO of Professional Science Editing for Scientists @ prosciediting.com