Qual a fiabilidade do alfa de Cronbach? Questões antigas e soluções modernas?

Marôco, João; Garcia‐Marques, Teresa

doi:10.14417/lp.763

Cited by 339 publications

(392 citation statements)

References 37 publications

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“…The questionnaire was validated with a Cronbach's alpha value of 0.75 (0.70-0.86; 95% CI), indicating some internal consistency for the construct (Maroco & Garcia-Marques, 2013). The data showed a normal distribution for BMI only (p-value=0.1809), justifying the use of nonparametric tests to establish independence between genders.…”

Section: Resultsmentioning

confidence: 94%

Relationship between psychosocial factors and musculoskeletal disorders in footwear industry workers

Silva¹,

Silva

Gontijo

2017

Prod.

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Section: Resultsmentioning

confidence: 94%

Relationship between psychosocial factors and musculoskeletal disorders in footwear industry workers

Silva¹,

Silva

Gontijo

2017

Prod.

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“…Para la determinación del número de factores a extraer se utilizó la regla de Kaiser-Guttman (Guttman, 1954). La consistencia interna de las subescalas se comprobó a través del análisis de fiabilidad realizado a los ítems con el coeficiente alfa ( ), fijando como criterio el valor .70 (Marôco & Marques, 2006).…”

Section: Análisis De Datosunclassified

Development and validation of a questionnaire to assess perceived quality in sports services

Ruíz¹,

Morales‐Sánchez²

2015

CCD

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ResumenEl objetivo del presente estudio fue examinar la estructura factorial del Cuestionario de Evaluación de la Calidad Percibida en Servicios Deportivos. Para ello se realizaron tres estudios diferentes con una muestra total de 867 usuarios (426 hombres y 431 mujeres), con edades comprendidas entre los 14 y los 81 años. Los resultados mostraron que el instrumento presenta adecuadas propiedades psicométricas. El índice de discriminación de los ítems mostró valores superiores a .40 y el nivel de consistencia interna fue adecuado en todas las subescalas ( > 0,75). El análisis de componentes principales mostró una solución estable compuesta por once factores, que explicaban más del 50% de la varianza en cada una. Los índices de bondad de ajuste para el modelo obtenido y puesto a prueba mediante análisis factorial confirmatorio fueron adecuados. Además, esta estructura dimensional se mostró invariante en función del género, mostrando equivalencia factorial y métrica. Futuros estudios deberían aplicarse a servicios de naturaleza y titularidad diferente, así como examinar la invarianza de medición en otras culturas.Palabras clave: calidad de servicio, evaluación de la calidad, servicios deportivos, calidad percibida. AbstractThe aim of this research was to examine the factorial structure of a questionnaire to assess perceived quality in sports services. For this purpose, three different studies were performed with a total sample of 867 users (426 men and 431 women), age between 14 and 81 years. The results showed that the instrument has adequate psychometric properties. The discrimination index of the items showed values above .40 and the level of internal consistency was adequate in all subscales ( > 0.75). Principal component analysis showed a stable structure composed of eleven factors, which explained more than 50% of the variance in each subscale. The confirmatory factor analysis indicated an adequate goodness-of-fit-indexes for the model obtained. Additionally, through a multi-group analysis, the findings indicate that the dimensions are not significantly different among gender, showing structural and metrical equivalence. Futures studies should apply different nature and ownership to services, as well as examine the measurement invariance in other cultures.Key words: service quality, quality assessment, sports services, perceived quality. IntroducciónLa calidad supone una estrategia de diferenciación al representar un mayor potencial de éxito (Al-Dweeri, 2011), convirtiéndose en uno de los constructos de mayor interés en el contexto de la gestión y los servicios deportivos dentro de las investigaciones actuales, más aún teniendo en cuenta el entorno al que se enfrentan las organizaciones de servicios, con cambios en las necesidades de los clientes y con una extensa diversidad en cuanto a demanda. La capacidad de una organización para ser competitiva y retener al usuario no sólo depende del desarrollo de servicios personalizados e innovadores, o en el feedback mutuo e inmediato con sus usuarios (Al-Dweeri, 20...

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“…Researchers often use Cronbach's alpha to estimate reliability (internal consistency of items). However, this test could present higher values when affected by such factors as: the number of items (the greater the number of items, the higher the alpha value), the intra-item and inter-item variability (the lower the intra-subject responses variability and the higher the inter-subject response variability, the greater the alpha value); the homogeneity of variances interitem (the greater the homogeneity of variance inter-item, the higher the alpha value) (3,27) , and the sample dimension (the greater the sample size, the higher alpha value).…”

Section: Historically There Has Been Debate Between Those Who Maintamentioning

confidence: 99%

“…Some of these aspects require, a standardization of observations before Cronbach's alpha calculation using mean correlations between items (standardized covariance) in order to correct the overestimation of the Cronbach's alpha caused by heterogeneous inter-item covariance (27) .…”

Section: Historically There Has Been Debate Between Those Who Maintamentioning

confidence: 99%

Analysis of variables that are not directly observable: influence on decision-making during the research process

Curado

Teles²,

Marôco

2014

Rev. esc. enferm. USP

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A dimensão da amostra, o tipo de variá-veis, o seu formato de medida, a construção dos instrumentos de recolha de dados válidos e fiáveis, são aspectos a ter em consideração no processo de investigação. No âmbito das ciências sociais, da saúde e especificamente na área de enfermagem, os instrumentos de recolha de dados são muitas vezes compostos por variáveis componentes ou indicadores que dão origem a variáveis latentes ou não observáveis diretamente, daí a importância da decisão relativa à forma como são medidas (escala ordinal, Likert ou de tipo Likert). As escalas psicométricas são exemplos de instrumentos, pelo tipo de variáveis que as integram, que podem trazer problemas de medida e de análise estatística (testes paramétricos versus não paramétricos). Assim o investigador quando usa estas variáveis deve respeitar alguns pressupostos baseados em estudos de simulação ou em recomendações fundamentadas na evidência científica, de forma a tomar a melhor decisão.

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Qual a fiabilidade do alfa de Cronbach? Questões antigas e soluções modernas?

Abstract: Resumo A análise da consistência interna de uma medida psicológica é uma necessidade aceite na comunidade científica. Entre os diferentes métodos que nos fornecem estimativas do grau

Cited by 339 publications

References 37 publications

Relationship between psychosocial factors and musculoskeletal disorders in footwear industry workers

Relationship between psychosocial factors and musculoskeletal disorders in footwear industry workers

Development and validation of a questionnaire to assess perceived quality in sports services

Analysis of variables that are not directly observable: influence on decision-making during the research process

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