Alternative procedures for testing fixed effects in repeated measures designs when assumptions are violated

  1. Herrero Díez, Francisco Javier 1
  2. Conejo Jiménez, Nélida María 1
  3. Vallejo Seco, Guillermo 1
  4. Fernández García, Paula 1
  1. 1 Universidad de Oviedo
    info

    Universidad de Oviedo

    Oviedo, España

    ROR https://ror.org/006gksa02

Revista:
Psicothema

ISSN: 0214-9915

Año de publicación: 2004

Volumen: 16

Número: 3

Páginas: 498-508

Tipo: Artículo

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Otras publicaciones en: Psicothema

Resumen

Procedimientos para contrastar efectos fijos en diseños de medidas repetidas cuando se incumplen los supuestos. En este artículo se examina el comportamiento de un modelo mixto con los grados de libertad ajustados mediante la corrección de Kenward-Roger y el procedimiento multivariado de Brown-Forsythe modificado en un diseño de medidas parcialmente repetidas. Estos dos enfoques fueron comparados con respecto a su potencia y robustez cuando los datos incumplían separada y conjuntamente los supuestos de normalidad conjunta multivariada y esfericidad multimuestral. Globalmente, las comparaciones Monte Carlo ponen de relieve que los dos enfoques controlaban adecuadamente las tasas de error cuando los datos eran normales, así como para cierto tipo de datos no normales. Sin embargo, el enfoque del modelo mixto basado en la verdadera estructura de covarianza tenía mayor sensibilidad para captar los efectos no nulos que el procedimiento de Brown-Forsythe modificado

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