search for: confirmatory

Displaying 20 results from an estimated 44 matches for "confirmatory".

2011 Mar 18
5
confirmatory factor analysis program in R
Does someone have confirmatory factor analysis program in R,which includes factor loading and some tests?thank you! -- View this message in context: http://r.789695.n4.nabble.com/confirmatory-factor-analysis-program-in-R-tp3386133p3386133.html Sent from the R help mailing list archive at Nabble.com.
2011 Mar 11
2
confirmatory factor analysis in R
In R software,does it have packages about confirmatory factor analysis in R software? 3Q -- View this message in context: http://r.789695.n4.nabble.com/confirmatory-factor-analysis-in-R-tp3347618p3347618.html Sent from the R help mailing list archive at Nabble.com.
2013 Mar 10
4
Confirmatory Factor Analysis
Hi, I'm trying to perform a hierachical, second order CFA. That's the thing that I need to leave AMOS. I found some sim.hierarchical and omega stuff, but nothing clear enough. Can anyone help me? I just need a simple and clear manual. Best, Pablo. [[alternative HTML version deleted]]
2004 Jan 29
1
Confirmatory Factor Analysis in R? SEM?
Hi Has anyone used R to conduct confirmatory factor analysis? This email pertains to use of SEM. For context consider an example: the basic idea is that there are a bunch of observables variables (say study habbits, amount of time reading in the bus, doing homework, helping other do homework, doing follow-up on errors etc.) and one believes...
2005 Mar 23
1
Confirmatory Factor Analysis in Non-Normal case
Hi: I am doing a confirmatory factor analysis now. In the analysis, I have null hypothesis test which specify some special structure for the loading matrix. And the alternative is there is no such special structure. Then the log likelihood ratio test can be used. The problem I have is my data comes from a questionnaire and all...
2009 May 22
1
Confirmatory factor analysis problems using sem package (works in Amos)
Hello all, I'm trying to replicate a confirmatory factor analysis done in Amos. The idea is to compare a one-factor and a two-factor model. I get the following warning message when I run either model: "Could not compute QR decomposition of Hessian. Optimization probably did not converge." I have no idea what to do here. I believe po...
2013 Apr 28
0
hierarchical confirmatory factor analysis with sem package
Hi, I am doing a hierarchical CFA using the sem package. I have 20 items, and I have 2 factors (F3 and F4), and also F1 and F2 are nested within F3. Here is the code that I have, but it is giving me an error message "Warning message: In eval(expr, envir, enclos) : Negative parameter variances. Model may be underidentified." and a further error "Error in summary.objectiveML(cfa,
2008 Sep 18
2
Difficulty understanding sem errors / failed confirmatory factor analysis
Hello, I'm trying to fit a pretty simple confirmatory factor analysis using the sem package. There's a CFA example in the examples, which is helpful, but the output for my (failing) model is hard to understand. I'd be interested in any other ways to do a CFA in R, if this proves troublesome. The CFA is replicating a 5 uncorrelated-factor st...
2011 Mar 27
2
Structural equation modeling in R(lavaan,sem)
I am a new user of the function sem in package sem and lavaan for structural equation modeling 1. I don?t know what is the difference between this function and CFA function, I know that cfa for confirmatory analysis but I don?t know what is the difference between confirmatory analysis and structural equation modeling in the package lavaan. 2. I have data that I want to analyse but I have some missing data I must to impute these missing data and I use this package or there is a method that can handl...
2004 Jul 13
5
Help with factanal and missing values
Hi list, I'm performing a series of confirmatory factor analysis on different groupings of items from data collected with questionnaires. There are some missing values. For those sets with no missing values I call factanal(datamatrix,factors=n) where datamatrix is a table of all observations for the items under investigation. This call fail...
2003 Apr 15
1
R capabilities: Bayesian estimation, Covariance Structure Analysis
I'm contemplating doing Bayesian estimation in R but am wondering how Bayesian estimation on R stacks up against BUGS. Is R reasonably complete, more difficult to use,...? Anyone care to share their experience? Also, am I right to conclude that covariance structure analysis & confirmatory factor analysis are not available in R? (I can't find them with help) Peter
2010 Feb 20
1
SEM error
I'm trying to do some confirmatory factor analysis on some data. My SEM model solves in 22 iterations, but when I try to look at the modification indices, using mod.indices, I get the following error message: Error in solve.default(hessian) : system is computationally singular: reciprocal condition number = 4.40283e-18 What does...
2009 May 20
1
sem with categorical data
I am trying to run a confirmatory factor analysis using the SEM package. My data are ordinal. I have read http://socserv.mcmaster.ca/jfox/Misc/sem/SEM-paper.pdf. When I apply the hetcor function, I receive the following error: Error in checkmvArgs(lower = lower, upper = upper, mean = mean, corr = corr, : at least one element o...
2010 Jan 03
1
Questions regarding sem using hetcor() function from polycor and diagrams
...to these questions, I apologize in advance if my questions were answered in the past. I also recognize that one of my questions unfortunately verges on statistical rather than code territory. I have two rather unrelated questions about using the sem and polycor packages for a relatively simple confirmatory path analysis: (1) My data requires using the hetcor function from the polycor package, and I ran the sem() function using a matrix from this code: hcor<-function(data) hetcor(data,std.err=FALSE,use="pairwise.complete.obs")$correlations I believe this means I am using a correlatio...
2007 Jun 27
1
SEM model fit
I wonder if someone could explain why, when I perform confirmatory factor-analysis model using polychoric correlations why I do not get an estimated confidence interval for the RMSEA. My experience with these type models is that I would obtain a confidence interval estimate. I did not get any warning messages with the output. RESULTS: Model Chisquare = 1374...
2011 Jun 01
3
error in model specification for cfa with lavaan-package
...7=c(5,4,3,4,4,3,4,NA,NA,4),x8=c(5,5,3,4,5,4,5,4,5,5),x9=c(5,1,1,1,NA,3,3,2,2,3),x10=c(5,5,2,3,4,3,1,3,2,5),x11=c(5,4,4,5,5,4,5,4,5,5),x12=c(5,4,5,5,5,4,5,5,5,5),x13=c(5,4,4,5,5,5,5,5,5,5),x14=c(5,3,3,NA,5,4,5,3,NA,5),x15=c(4,4,4,3,4,5,2,4,5,5),x16=c(5,4,3,3,4,4,3,3,4,5)) and I want to carry out a confirmatory factor analysis using the "cfa" function (lavaan). library(lavaan) then I specify my model cfa.model<-'      f1=~x1+x2+x3+x4+x5                 f2=~x6+x7+x8+x9+x10+x11                 f3=~x12+x13+x14+x15+x16 ' and run the cfa routine fit<-cfa(cfa.model,data=df.cfa,missi...
2013 Feb 09
1
Troubleshooting underidentification issues in structural equation modelling (SEM)
Hi all, hope someone can help me out with this. Background Introduction I have a data set consisting of data collected from a questionnaire that I wish to validate. I have chosen to use confirmatory factor analysis to analyse this data set. Instrument The instrument consists of 11 subscales. There is a total of 68 items in the 11 subscales. Each item is scored on an integer scale between 1 to 4. Confirmatory factor analysis (CFA) setup I use the sem package to conduct the CFA. My code is as...
2007 Apr 09
3
sem vs. LISREL: sem fails
I am new to R. I just tried to recreate in R (using sem package and the identical input data) a solution for a simple measurment model I have found before in LISREL. LISREL had no problems and converged in just 3 iterations. In sem, I got no solution, just the warning message: "Could not compute QR decomposition of Hessian. Optimization probably did not converge. in: sem.default(ram =
2010 May 19
0
New package: `lavaan' for latent variable analysis (including structural equation modeling)
Dear R-users, A new package called `lavaan' (for latent variable analysis) has been uploaded to CRAN. The current version of lavaan (0.3-1) can be used for path analysis, confirmatory factor analysis, structural equation modeling, and growth curve modeling. More information can be found on the website: http://lavaan.org Some notable features of lavaan: - the 'lavaan model syntax' allows users to express their models in a compact, elegant and useR-friendly way - lav...
2011 Apr 27
0
lavaan version 0.4-8
Dear R-users, A new version of `lavaan' (for latent variable analysis) is now available on CRAN. The current version of lavaan (0.4-8) can be used for path analysis, confirmatory factor analysis, structural equation modeling, and growth curve modeling. More information can be found on the website: http://lavaan.org To get a first impression of how the 'lavaan model syntax' looks like, below is the full R code for fitting a SEM model: ## begin R Code ## library(la...