search for: 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...

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)) the attribute as calculated at present is the inverse correlation matrix. try following example: # start example l<-matrix(c(.8,.7,.6,0,0,0,0,0,0,...

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 o...

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&quo...

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 something I should explore more c...

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...

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 <- diag(solve(t(U) %*% U)) U <...

# 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 Lambda' Sigma^-1...

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 inflated because some of the variance in a factor may not be unique to it. To address this and facilitate the interpretation of factors...

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

...ak, 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... ProMAX/SeisSpace, a geophysical calculation software edited by Halliburton and costing roughly $ 50.000 / workstation still requires RHEL 5.x to run. :o) -- Microlinux - Solutions informatiques durables 7, place de l'?glise - 30730 Montpezat Site : https://www.microlinux.fr Blog : https://blog.micr...

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 varimax a...

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 obtain the temporal evolution and...

...E,polycor=F, ??????????? ML = FALSE,??std.err=FALSE,progress=TRUE) #Regular PCA using stat, psych and FactoMiner, respectively #There is no option for?including the matrix princomp(responses, cor=TRUE) #What kind of correlation is used here? ? principal(r = responses, nfactors = 3, rotate = "Promax") principal(r = W, nfactors = 3, rotate = "Promax") #Do not work PCA(responses, scale.unit=TRUE, ncp=3, graph=T) #How to conduct polychoric principal component analysis using either of #the above package and producing individual and variable factor maps as #above Peter Maclean Dep...

...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 = "promax". Since I got no replies, and I am really tired of my R-curious social science colleagues asking "What, it can't even display factor correlations?!", I made the changes myself. I would be very grateful if they'd find their way into a release. I corrected a small error in Joh...

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

Hello, I would like to configure dovecot lda for local users. My dovecot vesion is 1.2.15. Dovecot documentation for System users says that only thing I should add to main.cf is: mailbox_command = /usr/local/libexec/dovecot/deliver (path to deliver) After that should I commented postfix/local process from master cf ? regards, Jarek

Hello, I got problem with setting quota from mysql for local users. In database are only information with quota. Password are store in passwd/shadow. My database have only simple info like in wiki description. Table created with: CREATE TABLE quota ( username varchar(100) not null, bytes bigint not null default 0, messages integer not null default 0, primary key (username) ); In

Hello, I use dovecot 1.2 version with postfix virtual users and mysql. All information about quota for every user is in mysql table. How dovecot compare if quota in database is over quota in /var/vmail/exampleuser directory ? It uses something like du command ? regards, Wamp

Thanks to Brian Ripley for the time and effort put into developing the factanal package for R. I have found it very useful. However, in trying to replicate some results from previous research, I have run into the need for a couple of extensions and was wondering if they might find their way into future implementations. 1. Though maximum likelihood estimates might be more rigorous and