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
1. You need to learn to use R Help. It is there for a purpose.
help (help)
## or
?help
is where to start.
2. Before posting further, please read An Introduction to R. Ships with
every distro.
3. ?gl
4. This is not the best way to do this anyway.
dd - expand.grid(b=1:4,a=1:3) ## is preferable
On Jul 3, 2012, at 4:10 PM, mms...@comcast.net wrote:
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.
What first part if the next part is ... this ?
b=g1(?) does what?
That's just generating a
On 03/07/2012 4:10 PM, mms...@comcast.net wrote:
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?
That is gl, not g1 (i.e. gee ell not gee one).See ?gl for a
description.
If David's response is what you were seeking, I would then ask: homework??
In general, explicit model matrices are not needed for linear modeling in R.
Still not clear what you meant by reparametrization, but if David's
interpretation is correct, my impossible comment is clearly wrong.
-- Bert
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