Latent class analysis issue
On 22/03/2008, at 4:18 AM, Byron Ellis wrote:
R-help would probably be a better place for answers to your question (this isn't a Mac specific problem), but at a guess the number of variables you've specified isn't the same as the number in your example. Though, I've never used e1071's LCA function (didn't even know they existed until just now) so I'm not positive.
Agreed this would be better in r-help, but we've got this far, so may as well continue. The lca function isn't particularly good. It is a bit specific about data, it requires a matrix, which is probably what is happening here. There are also some other failings, such as not allowing for the models to be fitted for a selection of random starting values, so is likely to get the wrong answer when fitting more than 2 or 3 classes. It also requires an observation for every subject rather than specifying frequencies. Yes, I should send my comments to the maintainer. A better package is poLCA, but also doesn't allow frequencies to be specified. I would set the nrep parameter to at least 10, but 20 is better. Has a nice user manual. I have a package in submission randomLCA which is mainly for LC incorporating random effects but fits LC as well. For the moment this can be downloaded at http://www.kjbeath.com.au/randomlca/ and installed as a Local Source Package. Comments welcome. Ken
On Fri, Mar 21, 2008 at 10:00 AM, David Kaplan <dkaplan at education.wisc.edu> wrote:
Hi all, I'm running the LCA procedure within the E1071 package. I'm receiving the following message that I don't understand
lcaread <- read.csv("~/Documents/Teaching/EP 773/EP 773 Examples/LCA
Example/lca.reading.csv", header=TRUE)
attach(lcaread) readclass <- lca(lcaread, 3)
Error in pas[j, ] <- drop(exp(rep(1, nvar) %*% log(mp))) : number of items to replace is not a multiple of replacement length
print(readclass)
Error in print(readclass) : object "readclass" not found
summary(readclass)
Error in summary(readclass) : object "readclass" not found Thanks in advance, David -- =============================================================== David Kaplan, Ph.D. Professor Department of Educational Psychology University of Wisconsin - Madison Educational Sciences, Room, 1061 1025 W. Johnson Street Madison, WI 53706 email: dkaplan at education dot wisc dot edu homepage: http://www.education.wisc.edu/edpsych/facstaff/kaplan/kaplan.htm Phone: 608-262-0836
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-- Byron Ellis (byron.ellis at gmail.com) "Oook" -- The Librarian
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