lm() implicitly assumes the presence of the intercept term in the model, i.e.,
lm(data ~ ftr)
is actually fitting
lm(data ~ 1 + ftr)
You can override this by doing
lm(data ~ ftr - 1)
You can always check the actual model being fitted by extracting the model
matrix:
model.matrix(data
Im trying to do regressions with constraints that the weights
are all =0 and sum(weights) = 1. I've read the archive and have
set the problem up with solve.QP and just the non-negativity constraints
along the lines of:
y as the data vector
X as the design matrix
D - t(X) %*% X
d - t(t(y)
Im trying to do regressions with constraints that the weights
are all =0 and sum(weights) = 1. I've read the archive and have
set the problem up with solve.QP and just the non-negativity constraints
along the lines of:
y as the data vector
X as the design matrix
D - t(X) %*% X
d - t(t(y)
It's easier to use crossprod, and you appear to have transposed A.
Here's a small example
library(quadprog) # which you never mentioned!
X - matrix(rnorm(100),, 4)
Y - 0.25* X %*% rep(1, 4) + 0.1*rnorm(25)
D - crossprod(X)
d - crossprod(X, Y)
A - cbind(1, diag(ncol(X)))
b - c(1, rep(0,ncol(X)))
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version
_
platform i686-pc-linux-gnu
arch i686
os linux-gnu
system i686, linux-gnu
status
major1
minor7.1
year 2003
month06
day 16
Hello,
Is there an easy way of determining whether one has reached
the end-of-file when reading a connection? I am reading a
binary file and I would like to know when the read fails.
Thanks,
Andy
--
Andy Jacobson
[EMAIL PROTECTED]
Program in
When the readBin gives a 0-length result. See the help file.
On Sun, 24 Aug 2003, Andy Jacobson wrote:
Is there an easy way of determining whether one has reached
the end-of-file when reading a connection? I am reading a
binary file and I would like to know when the
BDR == Prof Brian Ripley [EMAIL PROTECTED] writes:
Andy Is there an easy way of determining whether one has reached the
Andy end-of-file when reading a connection? I am reading a binary
Andy file and I would like to know when the read fails.
BDR When the readBin gives a
