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Cálculo e interpretación del Alfa de Cronbach para el caso de validación de la consistencia interna de un cuestionario, con dos posibles escalas tipo Likert

Calculation and interpretation of Cronbach's Alpha for the validation of the internal consistency of a questionnaire, with two possible Likert scales
[journal article]

González Alonso, Jorge
Pazmiño Santacruz, Mauro

Abstract

Three alternatives for calculating Cronbach's alpha were used. These were: by the variance of the items using MS Excel, using SPSS (22) and using the statistical software package free distribution Factor (9.3). These three variants were applied to validate the internal consistency of a questionnaire... view more

Three alternatives for calculating Cronbach's alpha were used. These were: by the variance of the items using MS Excel, using SPSS (22) and using the statistical software package free distribution Factor (9.3). These three variants were applied to validate the internal consistency of a questionnaire, with two possible Likert scales, one of five points and another with seven. This questionnaire was designed for the analysis of the criteria for students specializing in Business Administration at the Universidad Central del Ecuador; in connection with the performance of the teacher, the course syllabus, assessment and recommended readings. It is argued that for an effective application of Cronbach alpha should be keep in mind that this coefficient must be considered within the broader problematic of reliability analysis and considerations regarding its application for the use ordinal response scales or Likert scales. The Factor (9.3) package was appropriate to explore relatively simple alternatives such as exclusion of variables or the option to use a polychoric correlation matrix The results confirm that it is insufficient an ordinary calculation of Cronbach's alpha to validate a scale, which was the case for the five-point Likert scale. Based on the results obtained may recommend the use of a Likert scale of 7 points.... view less


En esta investigación se emplearon tres alternativas para el cálculo del alfa de Cronbach. Estas fueron: mediante la varianza de los ítems empleando MS Excel, con el paquete estadístico SPSS (22) y utilizando el paquete de libre distribución Factor (9.3). Estas tres variantes se aplicaron para valid... view more

En esta investigación se emplearon tres alternativas para el cálculo del alfa de Cronbach. Estas fueron: mediante la varianza de los ítems empleando MS Excel, con el paquete estadístico SPSS (22) y utilizando el paquete de libre distribución Factor (9.3). Estas tres variantes se aplicaron para validar la consistencia interna de un cuestionario, con dos posibles escalas tipo Likert, una de cinco puntos y otra de siete que debía diseñarse para el análisis de los criterios de los estudiantes de la especialidad de Administración de Empresas, de la Universidad Central del Ecuador en relación con el desempeño del docente, el programa de la asignatura, la evaluación y los textos recomendados. Se discute que para una aplicación efectiva del alfa de Cronbach no puede perderse la perspectiva de que este coeficiente debe considerarse dentro de la problemática más amplia del análisis de confiabilidad y las consideraciones en relación con su aplicación al utilizar escalas tipo Likert. El paquete Factor (9.3) resultó apropiado para poder explorar de forma relativamente sencilla diferentes posibilidades como la exclusión de variables o poder utilizar la opción de matriz de correlación policórica. Los resultados confirman que no basta con el cálculo usual del alfa de Cronbach para poder validar una escala, lo que fue el caso para la escala Likert de cinco puntos. En base a los resultados obtenidos se puede recomendar el empleo de la escala de Likert de 7 puntos.... view less

Keywords
scale construction; validation; consistency; method; questionnaire; statistics; factor analysis

Classification
Methods and Techniques of Data Collection and Data Analysis, Statistical Methods, Computer Methods

Free Keywords
Cronbach's alpha; Likert scales

Document language
Spanish

Publication Year
2015

Page/Pages
p. 62-67

Journal
Revista Publicando, 2 (2015) 1

ISSN
1390-9304

Status
Published Version; reviewed

Licence
Creative Commons - Attribution-NonCommercial-ShareAlike


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© 2007 - 2025 Social Science Open Access Repository (SSOAR).
Based on DSpace, Copyright (c) 2002-2022, DuraSpace. All rights reserved.