Displaying 20 results from an estimated 500 matches similar to: "temporal evolution and variance after rotation of eof"
2003 Feb 27
0
spatial evolution and variance after rotation of Principal components
Dear R users,
I have been doing rotation on Principal components analyse, with varimax
function and promax. Following those changes, I cannot find now how to get
the spatial evolution and the variance. Indeed, with the function princomp
that has been used to get the principal components, arguments such as $scores
and $sdev were available to get the spatial evolution and the variance, with
2003 May 13
0
bug in promax?
I was wondering whether the following inconsistency of the promax
rotation function with the results of a promax rotation using SAS
should be considered a bug in the promax function of R. Any comments
will be highly appreciated.
The following is a loading matrix obtained from a varimax rotation in SAS:
# Factor loadings after varimax rotation
x <- t(array(c(0.78107, 0.35573,
2003 May 01
0
factanal
# I have a question about how factanal is calculating the regression factor
# scores based on an oblique rotation (promax) of the factors.
#
# As is explained in the help file, regression factor scores are
# obtained as
#
# hat f = Lambda' Sigma^-1 x
#
# However, according to Harman's "Modern Factor Analysis" (e.g. second
# edition, pp. 351-352) the formula is
#
# hat f = Phi
2005 Feb 08
1
link to an alias in another package
In some documentation for a package I am working on I have
> \code{\link[stats]{varimax}}
> \code{\link[stats]{promax}}
The link to varimax works, but not the one to promax. Promax is an alias
under \name{varimax}. This kind of link works within a package, but I'm
not sure if it is suppose to work when it is a link to another package.
Is this a known limitation or bug, or
2009 Aug 17
1
lm.fit algo
Hi, everyone,
This is a little silly, but I cant figure out the algorithm behind
lm.fit function used in the context of promax rotation algorithm:
The promax function is:
promax <- function(x, m = 4)
{
if(ncol(x) < 2) return(x)
dn <- dimnames(x)
xx <- varimax(x)
x <- xx$loadings
Q <- x * abs(x)^(m-1)
U <- lm.fit(x, Q)$coefficients
d <-
1998 Nov 25
1
varimax and promax rotation
Hi:
How i can make Varimax and Promax Rotation in R 0.63
thanks
Jorge M. A. Magalhães
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !) To: r-help-request at
2011 Jun 22
1
Factor Analysis with orthogonal and oblique rotation
Hello
I seem to find only two types of rotation for the factanal function in R, the Varimax and Promax, but is it possible to run a orthogonal and oblique rotations in R?
Thanks in advance
Rosario
2007 May 25
1
Variable expansion in LDA vs POP/IMAP
Hello all,
I'm trying to understand when exactly the variable substitution
happens in Dovecot, as I get different results in the LDA and in the POP/IMAP
server.
Here's my general setup:
- Postfix MTA, delivers mail via Dovecot LDA
- users list sits in a database
- mail directory is stored in the database, but with
Dovecot variables inside
Delivery works perfectly fine,
2006 May 19
1
factor analysis - discrepancy in results from R vs. Stata
Hi,
I found a discrepancy between results in R and Stata for a factor analysis
with a promax rotation. For Stata:
. *rotate, factor(2) promax*
(promax rotation)
Rotated Factor Loadings
Variable | 1 2 Uniqueness
-------------+--------------------------------
pfq_amanag~y | -0.17802 0.64161 0.70698
pfq_bwalk_~ø | 0.72569 0.05570
2008 Sep 09
1
Addendum to wishlist bug report #10931 (factanal) (PR#12754)
--=-hiYzUeWcRJ/+kx41aPIZ
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 8bit
Hi,
on March 10 I filed a wishlist bug report asking for the inclusion of
some changes to factanal() and the associated print method. The changes
were originally proposed by John Fox in 2005; they make print.factanal()
display factor correlations if factanal() is called with rotation =
2006 May 09
1
xmalloc symbol in libssh
Hi list,
(Please Cc: me in your replies because I'm not subscribed to this list.)
While trying to build lukemftpd staticaly on FreeBSD, I got a link-time
error. Libssh.a indeed provides the "xmalloc" symbol (I suppose there
are more). I wonder if this is whether intentional or not. It is a
very common function name, and I think it would be worth renaming
it to something like
2002 Mar 16
1
promax (PR#1389)
Full_Name: conor dolan
Version: 1.4.0
OS: windows98
Submission from: (NULL) (146.50.170.247)
On the basis of Lawley and Maxwell's explanation in Factor Analysis as a
Statistical Method (London: Butterworth, 1971), the following line in the promax
routine (library, mva):
attr(z, "covariance") <- crossprod(U)
should be
attr(z, "covariance") <- solve(crossprod(U))
2007 Mar 04
1
factor analysis and pattern matrix
Hi,
In a discussion of factor analysis in "Using Multivariate Statistics" by
Tabachnick and Fidell, two matrices are singled out as important for
interpreting an exploratory factor analysis (EFA) with an oblique promax
rotation. One is the "structure matrix". The structure matrix contains the
correlations between variables and factors. However, these correlations may
be
2005 Jun 20
1
Factanal loadings as large as 1.2 with promax -- how unusual?
I am performing a large (105 variable) factor analysis with factanal,
specifying promax rotation. I kow that some loadings over 1.0 are not
unsual with that rotation, but I have some as large as 1.2, which seems
extreme. I am skirting the assumptions of the model by using responses
on a 7-point rating scale as data; I may have to go back and compute
polychoric correlations instead of product
2005 Jun 26
0
Factor correlations in factanal
Dear R-devel list members,
Ben Fairbank draw it to my attention that factanal() (in the stats package)
doesn't report factor correlations for oblique rotations. Looking at the
source, I see that factanal also doesn't save the factor-transformation
(rotation) matrix from which these correlations can be computed. I've
modified the source, attached below, so that the transformation
2013 Dec 17
1
Polychoric Principal Component Analysis (pPCA)
I have data set with binary responses. I would like to
conduct polychoric principal component analysis (pPCA). I know there are several packages used in PCA but I could not find one that directly estimate pPCA and graph the individuals and variables maps. I will appreciate any help that expand these reproducible scripts.
#How to conduct polychoric principal component analysis pPCA using
#either
2005 Mar 22
3
Newbie: Matrix indexing
Hi all,
I need to compute some "occurence matrix": given a zero matrix and a set
of paired indexes, I want to store the number of occurences of each paired
index in a matrix. The paired indexes are stores as an index matrix. I
prefere not to use loops for performances purpose.
Here follows a dummy example:
> occurence <- matrix(0, 2, 2); data
[,1] [,2]
[1,] 0 0
2006 Mar 23
0
sqlSave
Dear Tobias,
I finally succeeded in exporting my dataframes from R into Access with
this script:
library(RODBC)
canal <- odbcConnectAccess("D:/Floristique.mdb")
sqlSave(channel=canal, dat=flore, tablename="Floristique", rownames=F,
safer=F, fast=F,
varTypes=c(dates="Date"))
odbcClose(canal)
My problem in exporting my dataframe "flore" seems to
2010 Jun 17
0
[LLVMdev] DiBcom is hiring !
DiBcom (http://www.dibcom.com) is a company designing chipsets in the
field of digital TV reception. The "DSP" team, in charge of the LLVM/CLANG
based compilation chain, as well as the cpu design, is hiring.
Beside participating to the toolchain development and deployment, you will
also be part of the improvement process, by proposing efficient coding style
for the dsp firmware or
2017 Nov 29
1
Admins supporting both RHEL and CentOS
Le 29/11/2017 ? 08:26, Sorin Srbu a ?crit?:
> If updated, the instrument software will break, like in an atomic mushroom
> cloud, rendering critical hardware non-working and lab people standing
> outside my office with torches, pitch-forks and all the shebang.
> Yupp, unfortunately that's the current state of some lab equipment
> manufacturers that use RHEL as a base...