AN IF-ITEM-DELETED SENSITIVE ANALYSIS OF CRONBACH’S ALPHA TECHNIQUE USING SIMULATED ANNELING ALGORITHM

Valdecy Pereira, Henrique Rego Monteiro da Hora, Helder Gomes Costa, Lívia Dias de Oliveira Nepomuceno

Resumo


<doi>10.12957/cadest.2014.15758

This work proposes a nonlinear model and also a solution method to improve the overall Cronbach’s alpha coefficient technique, by grouping items of an instrument (questionnaire) that should be considered to deletion. The classical method called if-item-deleted Alpha also improves the overall reliability, however it considerers the deletion of only one item per time. Due to the combinatorial nature of the proposed model, a simulated annealing algorithm was implemented in order to achieve optimal or near optimal solutions. We presented an example for a simulated questionnaire with 15 items and 22 respondents. The obtained solution indicates the deletion of 8 items for maximum alpha or 2 items to exclude the most problematic items.


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DOI: https://doi.org/10.12957/cadest.2014.15758

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ISSN impresso: 1413-9022 / ISSN on-line: 2317-4536

DOI do periódico: dx.doi.org/10.12957/cadest


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