please consider the following example:
#start code
set.seed(123)
level<-rnorm(18, 10,3)
group1<-rep(letters[1:3], each=6)
summary(aov(level~group1))
group2<-rep(1:3,each=6)
str(group2)
summary(aov(level~group2))
#same result as for group1
summary(aov(level~factor(group2)))
#same result ad for aov
anova(lm(level~group2))
#end code
what I would like to do is to perform an anova among groups (analysis of
variance for three different gruops);
consider that groups are completely arbitrary: they are not intended to
have any sort of scaling or ordinal meaning;
in my example same groups are coded in two alternative ways: group1 as
"chr" (factor) and group2 as "num"; so by keeping in mind my purpose (is
there any difference in the level among groups?) I would simply consider
the result of aov() for group2 (num) as a non sense (with respect to my
specific purpuse)
is that a correct interpretation?
I hope not having misinterpreted the indications of the following thread
http://r.789695.n4.nabble.com/Question-about-factor-that-is-numeric-in-aov-td2164393.html
thank you for any help
best regards
max
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