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Our correct use of ANCOVA yields acceptable results
Published online by Cambridge University Press: 02 February 2007
Extract
Gilmore (2007) argues that the use of ANCOVA in Anstey et al. (2006) is invalid. Based on quotes in Winer (1971), he claims that covariates cannot be used to adjust interaction terms involving within-subject variables. Because the within-subject variable in Anstey et al. (2006) is time, he concludes that the results involving Time × Group interaction coefficient are invalid and consequently all analyses need to be re-done.
- Type
- LETTERS TO THE EDITOR
- Information
- Journal of the International Neuropsychological Society , Volume 13 , Issue 2 , March 2007 , pp. 371
- Copyright
- © 2007 The International Neuropsychological Society
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