Introducción: El objetivo de esta investigación fue confirmar la estructura interna de la Environmental Reward Observation Scale (EROS) y recoger evidencias de su relación con otros constructos en una muestra colombiana de 902 adultos que consintieron participar voluntariamente. Método: Se realizaron análisis psicométricos con Teoría Clásica de los Test y el modelo de Rasch. Se recolectaron evidencias de validez de la estructura interna y de la relación de las puntuaciones con otras variables. Resultados: Se obtuvieron buenos índices en los coeficientes alfa y omega de McDonald, nueve de los 10 ítems tuvieron buenos ajustes en los índices infit y outfit, y el ítem ocho presentó DIF en el nivel educativo. Se confirmó la estructura unidimensional de la EROS y fue invariante respecto al sexo y nivel educativo. Los puntajes tuvieron correlaciones de magnitud alta con sintomatología emocional y variables afines a la Activación Conductual. Conclusiones: La EROS presentó altas calidades psicométricas para su uso en población colombiana; sin embargo, se recomienda su uso solo para evaluación de tamizaje, porque los niveles de información están centrados en un área reducida a lo largo de la métrica logit.
Introduction: This study analysed the psychometric properties of the Reward Probability Index (RPI) in an online Colombian sample with 1129 participants. Method: To conduct a cross-validation study, the sample was randomly divided into two subsamples. An exploratory factor analysis was conducted with the first subsample yielding a two-factor structure. Then, the fit of this two-factor model was tested on the second subsample by conducting a confirmatory factor analysis. Results: This model obtained a good fit to the data and measurement invariance across gender was observed. The RPI also showed good internal consistency according to both Cronbach’s alpha and McDonald’s omega, scoring .88 in both cases. The RPI demonstrated convergent construct validity given its correlations with other related measures such as the Environmental Reward Observation Scale (r = .81), and the full version of the Behavioral Activation Scale for Depression (r = .71). Conclusions: The RPI showed good psychometric properties in this Colombian sample.
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