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es45
2006 Feb 16
0
factors and contrast matrix
...expression between 10 hours and 48 hours?
ES - with estrogen in 10 hours
T48 - time 48 hours
ES:TS - probes with estrogen and in 48 hours
(Just by the way:
4. does everything has to do with matrices multiplications? )
the book propose this contrast matrix:
> contM <- cbind(es10=c(0,1,0,0), es48=c(0,1,0,1))
> contM
es10 es48
[1,] 0 0
[2,] 1 1
[3,] 0 0
[4,] 0 1
5. But why? How do I suppose to know it? Is it also a multiplication of some
matrices?
6. What stands the columns or the lines for?
I'll be happy for every kind of help I can get. If someone know...