Hello,
I want to create a design matrix using R. Can you explain the code which
creates the following please? I understand the first part.
b=g1(?) does what?
dd <- data.frame(a = gl(3,4), b = gl(4,1,12)) # balanced 2-way
dd
a b
1 1 1
2 1 2
3 1 3
4 1 4
5 2 1
6 2 2
7 2 3
8 2 4
9 3 1
10 3 2
11 3 3
12 3 4
I am using the tree dataset in R. I want to form a reparameterized design
matrix in ones, zeroes and minus ones. The dataframe dd is very important here.
Can anyone assist here? Thanks in advance.
Mary A. Marion
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