[R] ANOVA precision

Steve Arthur sarthur at protogene.com
Wed Sep 13 03:23:19 CEST 2000


Hi, I just ran a one-way ANOVA using R and compared the output to a
one-way ANOVA I created using SAS on the same data set.

Here are the results:


           DF  Sum Sq   Mean Sq  F value  Pr(>F)
Base       3   27.7449  9.2483   107.99   < 2.2e-16 *** 
Residuals 32    2.7449  0.0856


            Sum Of
Source DF   Squares Mean   Square       F Value   Pr > F
Model   3   27.69085439    9.23028480   107.55    <.0001
Error  32    2.74643538    0.08582611

In a "philosophical" sense, are the rounding differences worth worrying
about (they may not be significant in this case, but sometimes the
differences are in the second digit), or is this an example of "use at
your own risk"?



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