Displaying 4 results from an estimated 4 matches for "derror".
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2003 Jun 08
2
LDA: normalization of eigenvectors (see SPSS)
...eproduce the steps included in a LDA. Concerning the eigenvectors there is
a difference to SPSS. In my textbook (Bortz)
it says, that the matrix with the eigenvectors
V
usually are not normalized to the length of 1, but in the way that the
following holds (SPSS does the same thing):
t(Vstar)%*%Derror%*%Vstar = I
where Vstar are the normalized eigenvectors. Derror is an "error" or
"within" squaresum- and crossproduct matrix (squaresum of the p
variables on the diagonale, and the non-diagonal elements are the sum of
the crossproducts). For Derror the following holds: Dtotal...
2003 Jun 09
1
understanding eigen(): getting non-normalized eigenvectors
...th?
E.g. take the example:
A
[,1] [,2]
V1 0.7714286 -0.2571429
V2 -0.4224490 0.1408163
Calculating eigen(A) "by hand" gives the eigenvectors (example from
Backhaus, multivariate analysis):
0.77143 and 0.25714
-0.42245 0.14082
but even eigen(solve(Derror)%*%Dtreat, symmetric = FALSE, EISPACK =TRUE)
which according to ?eigen should not necessarily give the normalized
eigenvectors give the vectors (such as eigen()):
$vectors
[,1] [,2]
[1,] 0.8770963 0.3162278
[2,] -0.4803146 0.9486833
-> how can I replicate the result we get &q...
2007 Jun 14
0
nlsList problems: control option does not effect output and strange environment search
...went well, but now I'm trying to do some more
sophisticated things and it does not work anymore.
I simulate my data from a five parametric logistic function like this:
Y<-as.data.frame(apply(params,1,function(x){
Y<-x[1]+(x[2]/(1+x[3]*exp(-1*x[4]*(1:240-x[5])))^(1/x[3]))+rnorm(240,0,s
derror)
return(Y)}))
params contains different parameters for 200 persons in 4 groups. Next I
sample for each person five observations one at the start, one at the
end and three randomly in between. Now I get the following error
messages:
testnlslist2<-nlsList(SSfpl,groupedData(Y~Time|group, datset))...
2017 Oct 22
1
ggplot2 and tikzDevice : problems with accents
Hi all,
I can't fathom why the accented "?" in the following ggplot2 graph makes
R hangs when using tikzdevice,? whereas it works using simple pdf device.
######
library(tikzDevice)
library(ggplot2)
options(tikzDefaultEngine = "luatex")
tikzLualatexPackages =c(
? "\\usepackage{tikz}\n",
? "\\usepackage[active,
tightpage,psfixbb]{preview}\n",
?