Diseño y análisis de la potencia: n y los intervalos de confianza de las medias

• Autores: Fernando García, Juan Pascual i Llobell, María Dolores Frías Navarro, Dirk Van Krunckelsven, Sergio Murgui Pérez
• Localización: Psicothema, ISSN-e 1886-144X, ISSN 0214-9915, Vol. 20, Nº. 4, 2008, págs. 933-938
• Idioma: español
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• Dialnet Métricas: 38 Citas
• Resumen

  • En este estudio se analiza la validez del criterio del 80% de potencia estadística para que no se solapen las medias de los intervalos de confianza (IC). Varias simulaciones indican que la potencia mínima para que los límites de dos medias no se solapen, cuando el IC está en el 95%, es de 0,80; pero cuando el IC está en el 99%, es 0,86; y cuando el IC está en el 90%, es 0,75. Si hay más de dos medias, la potencia mínima aumenta considerablemente. Siendo todavía mayor este aumento cuando las medias poblacionales no aumentan monotónicamente. Por lo tanto, para garantizar que los límites no se solapen, en la mayoría de las situaciones analizadas es necesario calcular directamente el mínimo número de observaciones, siendo de poca utilidad los criterios convencionales de la potencia mínima de 0,80

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