[R] ANOVA/aov question

From: <eph1v3t8-rhls6783_at_mailblocks.com>
Date: Tue 26 Jul 2005 - 06:04:52 EST


I'm a bit confused about the anova/aov functions. Both seem to rely on data models, where the relationship between the dependent variables and the independent variables can be expressed as a formula. In what I am trying to do, all of my independent variables are qualitative, not quantitative. For example, for each of two options, "option A" and
"option B" I have collected a set of measurements of the same quantity,
and I wish to do an ANOVA test to see if that factor (actually I have three factors, with 2 levels each) has a significant influence on the measured quantity.

Can R be used for this kind of ANOVA, or must the independent variables be quantitative in nature? If the answer is that it can be done, and that it can be done with anova/aov, how do I go about expressing the
"data model" for qualitative factors?

Thanks much,

    --Paul



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