Dear Ingmar, thank you for your email. This means that a non-random latent class model for a 2x2x2 table (3 diagnostic tests) and 2 latent classes produces a saturated model. The predicted frequencies equal the observed frequencies.
Is there any reason to introduce random effects in a saturated model? thanks gabriele 2012/8/28 Ingmar Visser <i.vis...@uva.nl>: > use str(dentistry.lca2) to see all values of the output; among them a value > np for number of parameters, in this case 5*2 for the 5 binary items of 2 > classes + 1 for the class proportions, total 11. > hth, Ingmar > > On Mon, Aug 27, 2012 at 6:05 PM, Gabriele Accetta > <gabriele.acce...@gmail.com> wrote: >> >> Can anybody, please, explain me how many parameter are estimated using >> randomLCA? >> >> For examples, model "dentistry.lca2random" estimate 1 scale (or >> variance, b_j) parameter and 2 position parameters (a_cj)? Doesn't >> it? >> Do I need at least 4 diagnostic tests for such a model? >> >> What happens if I specify options blocksize and byclass? How many >> diagnostic tests (or rater) I need? >> >> >> Extract from see "randomLCA examples", by Ken Beath. >> >> > dentistry.lca2random <- randomLCA(dentistry[, >> + 1:5], freq = dentistry$freq, initmodel = dentistry.lca2, >> + nclass = 2, random = TRUE, quadpoints = 31, >> + probit = TRUE) >> >> >> Thank you. >> >> ______________________________________________ >> R-help@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide >> http://www.R-project.org/posting-guide.html >> and provide commented, minimal, self-contained, reproducible code. > > -- Gabriele Accetta "E' evidente che non si ha vera democrazia là dove l'accesso all'istruzione non è garantito in misura pari a tutti i cittadini: perché, importando necessariamente la diversa cultura una diversa possibilità di partecipazione alla vita politica, il privilegio dell'istruzione si risolve necessariamente in privilegio politico." Piero Calamandrei ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
