"Anna H. Pryor" <[EMAIL PROTECTED]> writes:
I looked at the Introduction to R and am still confused. Would it be possible to ask a question in which I have three vectors and I want to perform an anova on them. Say A,B, and C. Is there a standard form that I could use in lm to get a model that I could use in anova? Do I need to know more about my problem?
I really appreciate any help in this.
There are many forms of anova. The type you describe, I presume, is data from three separate groups, aka one-way ANOVA. You need to first force your data into the parallel-vector layout like this
y <- c(A,B,C) group <- factor(rep(1:3,c(7,9,13))) # provided there are 7 elements # in A, 9 in B and 13 in C
and then
anova(lm(y~group))
or, for some more options, consider
oneway.test(y~group)
Peter, being modest, didn't mention that he's written a very good book about R for technical people who aren't statisticians. At fatbrain:
http://search.barnesandnoble.com/textbooks/booksearch/isbnInquiry.asp?isbn=0387954759&TXT=Y&itm=1
If you're not a statistician but are required to use some statistical methods (such as anova), this is a very helpful book. Most of R's documentation is aimed at statisticians, so this book fills a gap very nicely.
Cheers
Jason -- Indigo Industrial Controls Ltd. 64-21-343-545 [EMAIL PROTECTED]
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