The unidimensionality of a measurement instrument: A factorial perspective
This article explains what we mean by the unidimensionality of a measurement instrument, therefore we present some definitions and theoretical contributions about this subject. Factor analysis is proposed as one of the many methods for assessing the unidimensionality of a measurement instrument. Th...
| Autor Principal: | Burga León, Andrés |
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| Formato: | Artículo |
| Idioma: | spa |
| Publicado: |
Pontificia Universidad Católica del Perú
2012
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| Materias: | |
| Acceso en línea: |
http://revistas.pucp.edu.pe/index.php/psicologia/article/view/642/629 |
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| Sumario: |
This article explains what we mean by the unidimensionality of a measurement instrument, therefore we present some definitions and theoretical contributions about this subject. Factor analysis is proposed as one of the many methods for assessing the unidimensionality of a measurement instrument. The use of Pearson correlations matrices on item-level factor analysis is identified as an important problem. Those correlations are problematic because items didn’t carry out the necessary assumptions in order to apply the Pearson correlation: interval-level measurement and normal distribution of the variable. As an alternative we propose and exemplify the use of tetrachoric and polychoric correlations. |
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