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{ Tag Archives } ANOVA

Why practitioners discretize their continuous data

Yihui asked this question yesterday. My supervisor Dr. Hau also criticized routine grouping discretization. I encountered two plausible reasons in 2007 classes, one negative, the other at least conditionally positive.
The first is a variant of the old Golden Hammer law -- if the only tool is ANOVA, every continuous predictor need discretization. The second reason [...]

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2009 03 05 lixiaoxu English Comments (5)

Type III ANOVA in R

Type III ANOVA SS for factor A within interaction of factor B is defined as , wherein A:B  is the pure interaction effect orthogonal to main effects of A, B, and intercept. There are some details in R to get pure interaction dummy IV(s).
Data is from SAS example PROC GLM, Example 30.3: Unbalanced ANOVA for [...]

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2008 11 18 lixiaoxu English Comments (1)