[R] help with contrasts.

From: Rodrigo Gazaffi <rgazaffi_at_carpa.ciagri.usp.br>
Date: Mon 26 Jun 2006 - 00:48:57 EST

Hello list,

I would like to know how can I use contrats in statistical analysis. I have a simple model, "one-way analysis of variance" "or two-way..."
(balanced case).

I've already used the command aov (model) to get the analysis of variance, but i know that my treatment could be organized in groups, so i would like to test these groups.

Example: I have 4 treatments t1, t2, t3, t4 and i would like to test
(1, 1, -1, -1) and (1, -1, 0, 0) and (0, 0, 1, -1).

thanks for the attention.

Rodrigo Gazaffi

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