Displaying 20 results from an estimated 900 matches similar to: "lm.fit algo"
2008 Sep 09
1
Addendum to wishlist bug report #10931 (factanal) (PR#12754)
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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 =
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 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
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
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
2007 May 13
1
factanal
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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))
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
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
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
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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 Oct 13
2
varimax rotation difference between R and SPSS
Hi,
I am puzzeled with a differing result of princomp in R and FACTOR in
SPSS. Regarding the amount of explained Variance, the two results are
the same. However, the loadings differ substantially, in the unrotated
as well as in the rotated form.
In both cases correlation matrices are analyzed. The sums of the squared
components is one in both programs.
Maybe there is an obvious reason, but I
2004 Nov 03
2
Princomp(), prcomp() and loadings()
In comparing the results of princomp and prcomp I find:
1. The reported standard deviations are similar but about 1% from
each other, which seems well above round-off error.
2. princomp returns what I understand are variances and cumulative
variances accounted for by each principal component which are
all equal. "SS loadings" is always 1.
3. Same happens
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 Mar 12
0
temporal evolution and variance after rotation of eof
Dear R users,
I have been doing some eof analysis using princomp function, then the eof
results were rotated with varimax and promax functions. Those functions are
working fine. However, after their uses, I cannot find how to obtain the
temporal evolution and the variance of the obtain components, as varimax and
promax does not have the arguments $scores and $sdev.
If any body, know how to
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...
2009 Apr 20
2
[LLVMdev] Summer of Code 2009 "Support for an ELF writer"
Hello
So how did it happen that the only project which was a candidate for
libJIT Summer of Code in GNU, with the same title got selected in
LLVM?
Does it mean that the same genius idea came to two minds?
Thanks,
Kirill
--
http://code.google.com/p/libjit-linear-scan-register-allocator/
2002 Jul 19
1
No subject
Hi, I am learining how to use R, specifically the princomp() function, and
I am trying to replicate the results I get in SPSS with no luck, can
anyone give me the equivalent options in SPSS' factor analysis routine?
Thanks, Adam
_____________________________________________________________________
Adam F. Simon
Department of Political Science 44 Gowen Hall
University of
2002 May 07
2
Discretization of numeric attributes
Dear R-helpers:
I am interested in discretization methods for numerical attributes, as they
are reported in the 'machine learning' community. For example, the work of
Fayyad & Irani (IJCAI-93), Kononenko, entropy-based approaches, MDL
principle, the C4.5 approach, etc. I am especially interested in those
methods that take a factor as goal target into account for discretizing