Carregant...
Fitxers
Tipus de document
ArticleVersió
Versió publicadaData de publicació
Llicència de publicació
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/218943
How to proceed when both normality and sphericity are violated in the repeated measures ANOVA
Títol de la revista
Director/Tutor
ISSN de la revista
Títol del volum
Recurs relacionat
Resum
Adjusted F-tests have typically been proposed as an alternative to the F-statistic in repeated measures ANOVA. Despite considerable research, it remains unclear how these statistics perform under simultaneous violation of normality and sphericity. Accordingly, our aim here was to conduct a detailed examination of Type I error and power of the F-statistic and the Greenhouse-Geisser (F-GG) and Huynh-Feldt (F-HF) adjustments, manipulating the number of repeated measures (3-6), sample size (10-300), sphericity (epsilon estimator of Greenhouse-Geisser from its lower to upper limit), and distribution shape (slight to extreme deviations from normality). The findings show that the behavior of F-GG and F-HF depends on the degree of violation of both normality, sphericity, and sample size. Overall, we suggest using F-GG under violation of sphericity and slight or moderate deviations from normality in all sample size; with severe deviations from both normality and sphericity F-GG may be used with a sample size larger than 10; and with extreme deviation from both normality and sphericity this statistic may be used with a sample size larger than 30. In the event of discrepant results between F-GG and F-HF, the choice depends on the epsilon value.
Matèries (anglès)
Citació
Citació
BLANCA MENA, M. josé, ALARCÓN POSTIGO, Rafael, ARNAU GRAS, Jaume, GARCÍA CASTRO, Javier, BONO CABRÉ, Roser. How to proceed when both normality and sphericity are violated in the repeated measures ANOVA. _Anales de Psicología_. 2024. Vol. 40, núm. 3, pàgs. 466-480. [consulta: 20 de gener de 2026]. ISSN: 0212-9728. [Disponible a: https://hdl.handle.net/2445/218943]