[R] Different results

[Berton Gunter]

x is numeric, so R consider this to be a linear regression, not a 3 group analysis. To do the latter in R:

x<-factor(1:3)

Read the R Introductory manuals or the first few and other relevant chapters Venables' and Ripley's MASS first, please!

-- Bert Gunter

vasilis pappas wrote:

> Hello everybody,
>    I've been practicing with some data in R and SPSS and I noticed that there are some differences in ANOVA results.
>
> For example with :
> y<-c(1,2,34,2,3,45,2,1,67,3,2,67,2,2,98,4,4,23,1,1,23,2,3,45) and
> x<-rep(c(1,2,3),8)
>
>    I get in R ( with summary(aov(y~x)) )
> MSres=350.7
> df=22
>
>    while in SPSS I get
> MSres=221.9
> df=21
>
> Can enyone explain me what is the problem or what am I doing wrong?
>                          Thanks for your interest a priori,
>                                                                        Vasileios.
>
> ---------------------------------
>
> Á?ïêôÞóôå ôçí äùñåÜí óáò@yahoo.gr
>
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--

Bert Gunter

Non-Clinical Biostatistics
Genentech
MS: 240B
Phone: 650-467-7374


"The business of the statistician is to catalyze the scientific learning process."

 -- George E.P. Box