[R] design

From: <daniela.marconi_at_libero.it>
Date: Mon 05 Jul 2004 - 22:46:43 EST


Hi

I have not understood very well how to realize, in limma package, the design (using factor in model.matrix) to insert in lmFit. I have an experiment with 4 groups (a,b,c,d) with 3 replicates for each-one and i have to compare a vs b; c vs d; ( a&c )vs (b&d). List Sample in pdata is like this:
1a
1c
1b
1d
2a
2c
2b
2d
3a
3c
3b
3d
How can i do this design with matrix model? thanks
daniela



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