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2007 Mar 15
0
Covariance matrix calc method question
...n some sort of
simulation along
the lines of below to check whether this could be the reason for the
differences. Thanks.
x<-c(11,12,13,14,16)
y<-c(2,4,6,8,12)
z<-c(14,18,22,50,20)
LHS<-cbind(x,y)
sample<-nrow(lhs)
# METHOD1
output1<-lm(LHS ~ z)
resids<-resid(output1)
sigma.hat1<-crossprod(resids)/sample
print(sigma.hat1)
print(det(sigma.hat1))
# METHOD2
fit1<-lm(LHS[,1] ~ z)
fit2<-lm(LHS[,2] ~ z)
correctionfactor<-sample-1/sample
sigma.hat2<-correctionfactor*var(cbind(resid(fit1),resid(fit2)))
print(sigma.hat2)
print(det(sigma.hat2))
2013 Mar 19
0
linear model with equality and inequality (redundant) constraints
...5), -1)
p.st1 <- runif(5, 0.1, 0.2)
## check constraints
A1%*%p.st1 > b1
M1 <- list(X=X1,
p=p.st1,
off=array(0,0),
S=list(),
Ain=A1,
bin=b1,
C=matrix(0,0,0),
sp=array(0,0),
y=r1,
w=r1*0+1)
(p.hat1 <- pcls(M1))
A1%*%p.hat1 > b1
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2003 May 27
4
multihost master.passwd sync
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Just wondered if anyone had any suggestions about syncing up master.passwd
files between multiple machines that didn't involve allowing root login
remotely? The users need to be able to log in remotely and own files on the
different machines.
~~
Andy Harrison
ah##@httpsite.com
ICQ: 123472 AIM/Y!: AHinMaine
[full headers for details]
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