[R] ANOVA procedure on the sufficient statistics

Liaw, Andy andy_liaw at merck.com
Wed Feb 18 14:40:34 CET 2004

You can apply the trick that Prof. Dalgaard recently posted in response to a
similar question (for one-way ANOVA).  For each cell, generate data as:

y <- cell.mean + cell.sd * scale(rnorm(cell.count))

Then generate the data frame to feed to aov.


> From: Yun-Fang Juan
> Hi, 
> I have a two-way anova with unequal cell numbers that I want 
> to analyze. 
> The problem is I don't have individual observations of the data.
> I only have the sufficient statistics (mean, variance, # of 
> observations) for each cell. 
> Is there any existing function in S-plus that would allow me 
> to do aov() with the sufficient statistics?
> The table is like 
>      G1 G2 G3 G5 G6
>  T1 
>  T2
>  T3
> For cell (Ti, Gj) i have mean,  variance and # observations 
> and the factors are unordered.
> Thanks a lot for helping me on this in advance.
> Yun-Fang
> 	[[alternative HTML version deleted]]
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