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Dispositional Optimism is Unidimensional or Bidimensional? the Portuguese Revised Life Orientation Test

Published online by Cambridge University Press:  10 January 2013

Jose Luis Pais Ribeiro ,
Luisa Pedro  and
Susana Marques
Jose Luis Pais Ribeiro*
Affiliation:
Universidade do Porto (Portugal)
Luisa Pedro
Affiliation:
Instituto Politécnico de Lisboa (Portugal)
Susana Marques
Affiliation:
Universidade do Porto (Portugal)
*
Correspondence concerning this article should be addressed to Jose Luis Pais Ribeiro. Universidade do Porto. Rua do Dr. Manuel Pereira da Silva, 4200-392 Porto (Portugal). E-mail: [email protected]
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Abstract

The aim of the study is to adapt and then discuss the appropriateness of the Life Orientation Test as a one or two dimension scale. The research includes two studies; one is composed of a sequential sample of 280 people with multiple sclerosis, 71 % female, and another includes a convenience sample of 615 individuals from the community, 51.1% female. Because the construct is built upon a theoretical assumption that has one dimension, we examine the hypothesis of one or two factor solutions through confirmatory factor analysis, and the two-dimension solution premise demonstrates better adjustment for both samples. The other psychometric properties explored show appropriate results for the Portuguese sample, and similar to the original ones; the Test therefore seems appropriate for use in cross cultural studies. Based on our results, we discuss whether the questionnaire is a one or two dimension instrument, concluding that it appears appropriate to accept the recommendations of the original authors to use it as a one-dimensional tool and, when necessary, to use both dimensions.

El objetivo del estudio es adaptar y discutir la adecuación de la prueba de Orientación de la Vida en una o dos escalas de dimensión. La investigación engloba dos estudios, uno constituido por una muestra secuencial de 280 personas con esclerosis múltiple, 71% mujeres y otro con una muestra de conveniencia de la comunidad de 615 individuos, 51,1% del sexo femenino. Como el constructo se asienta sobre la presunción teórica de que tiene una dimensión, inspeccionamos la hipótesis de una o dos soluciones de factor a través del análisis factorial confirmatorio y la hipótesis de dos dimensiones manifiesta un mejor ajuste para ambas muestras. Las otras propiedades psicométricas exploradas muestran los resultados apropiados para la muestra portuguesa, y semejantes a los originales. Parece apropiado para los estudios culturales transversales. Basándonos en nuestros resultados, discutimos si el cuestionario es un instrumento de una o dos dimensiones, concluyéndose que parece conveniente seguir las recomendaciones de los autores originales, para utilizarlo como un instrumento unidimensional y, si fuera necesario necesario, utilizar cada una de las dimensiones.

Keywords

optimismvalidation studyLOT-R dimensionalityoptimismoestudio de validacióndimensionalidad LOT-R
Type
Research Article
Information
The Spanish Journal of Psychology , Volume 15 , Issue 3 , November 2012 , pp. 1259 - 1271
Copyright
Copyright © Cambridge University Press 2012

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