Displaying 20 results from an estimated 11000 matches similar to: "link to an alias in another package"
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 <-
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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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,
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 =
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
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
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
2011 Dec 24
1
extract factor scores post-varimax
Hello all,
I've run a principal component regression using the PLS package. I then
applied varimax rotation (i.e., using
http://stat.ethz.ch/R-manual/R-patched/library/stats/html/varimax.html). I
cannot figure out how to extract the factor loadings post-varimax. Is
there a command to do this? scores(x) does not do it.
Thanks and happy holidays
--
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2009 Jan 30
3
princomp - varimax - factanal
Hi!
I am trying to analyse with R a database that I have previously analysed
with SPSS.
Steps with SPSS:
Factorial analysis
Extraction options : I select = Principal component analysis
Rotation: varimax
Steps with R:
I have tried it with varimax function with factanal or with princomp...and
the results are different of what I have with SPSS. I think that varimax
function is incorporated in
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
2012 Oct 19
1
factor score from PCA
Hi everyone,
I am trying to get the factor score for each individual case from a principal component analysis, as I understand, both princomp() and prcomp() can not produce this factor score, the principal() in psych package has this option: scores=T, but after running the code, I could not figure out how to show the factor score results. Here is my code, could anyone give me some advice please?
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
2008 Sep 09
2
NMDS and varimax rotation
hello,
subsequently to a NMDS analysis (performed with metaMDS or isoMDS) is
it possible to
rotate the axis through a varimax-rotation?
Thanks in advance.
Bernd Panassiti
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
2004 Feb 17
1
varimax rotation in R
Hi everyone-
I have used several methods to calculate principal components rotated using the varimax procedure. This is simple enough. But I would like to calculate the % of variance explained associated with each PC before and after rotation.
factanal returns the % of variance explained associated with each PC but I cannot seem to get it to change after rotation.
Many thanks for your
2004 Feb 17
1
Comparison of % variance explained by each PC before AND after rotation
Hello again-
Thanks to Prof. Ripley for responding to my previous question.
I would like to clarify my question using sample code. I will use some
sample code taken from ?prcomp
Again, I would like to compare the % variance explained by each PC
before and after rotation.
< code follows >
data(USArrests)
pca = prcomp(USArrests, scale = TRUE)
# proportion variance explained by each
2009 Mar 31
3
Factor Analysis Output from R and SAS
Dear Users,
I ran factor analysis using R and SAS. However, I had different outputs from
R and SAS.
Why they provide different outputs? Especially, the factor loadings are
different.
I did real dataset(n=264), however, I had an extremely different from R and
SAS.
Why this things happened? Which software is correct on?
Thanks in advance,
- TY
#R code with example data
# A little