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There were no significant differences in the Cronbach alpha reliability coefficients of the three tests and those for the structure sections and also overall were very closely aligned, with the coefficients for the reading sections somewhat lower as well as being more widely spread due to the lower number of items on which the calculation of the coefficients was based.
The model revision led to a final model that still contained the same number of factors, but a slightly lower number of items (42 instead of 47).
Its internal consistency reliability was short of the 0.80 which is deemed to be acceptable [ 11] (although that is partly a consequence of the lower number of items).
Although it is true that alpha is a function of item inter-correlation, it is believed that alpha is also affected by the number of items; lower number of items result in lower alpha, as proven by Cortina [ 59].
Purification has been shown to be beneficial in DIF analyses in other fields [ 59, 60], but has rarely been used in HRQoL research [ 61], perhaps owing to the lower number of items in HRQoL subscales.
However, in multivariate analysis, there was no significant reduction in error risk and it is likely that the effect could be due to lower number of items per prescription (mean 3.5, vs pooled data: 6.3).
Similar(54)
The rating system we used is less responsive in BSS due to the lower number of applicable items.
A lower number of ADI-R items that reached the autism criterion can be considered indicative of a relative reduction in symptom heterogeneity.
This study indicates that explicitly incorporating context factors into communication assessment in a protocolized way leads to a significantly lower number of applicable MAAS-Global items per consultation, and to higher item scores.
At each step we determined the explanatory power of the algorithm by testing that the removal of any item resulted in a lower number of total hits.
Lower numbers of ratings resulted from missing items and when patients were discharged from the ward prior to the third day after hospitalization.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com