Message-ID: <199908300742.RAA15629@iliad.anu.edu.au>
Date: 1999-08-30T07:42:05Z
From: Thomas Yee
Subject: model.matrix()
Hi,
In R I get the following:
> x <- 1:9
> f <- as.factor(1:9)
> i <- model.matrix(~x+f)
>
> attr(i, "assign")
[1] 0 1 2 2 2 2 2 2 2 2
whereas in S I get the following:
> attr(i, "assign")
$"(Intercept)":
[1] 1
$x:
[1] 2
$f:
[1] 3 4 5 6 7 8 9 10
Has anybody written a model.matrix function to get the same
result as S? It's just that S's output is what I want, viz.,
1. the names "(Intercept)","x","f", and
2. the vector values.
Thanks
Thomas
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