Dear Renata, You can do this by combining the sem() and boot.sem() functions in the sem package with hetcor() in the polycor package; boot.sem() computes standard errors for parameter estimates by bootstrapping.
See ?boot.sem for an example of a confirmatory factor-analysis model with ordinal indicators. See ?sem for many examples of structural-equation models with latent variables. Just combine the two. Note that a dichotomous indicator is in effect a two-category ordinal variable and may be handled as such. For example, the polychoric correlation between two dichtomous variables is just their tetrachoric correlation. I hope this helps, John On Mon, 10 Oct 2005 11:23:25 -0300 "Renata" <[EMAIL PROTECTED]> wrote: > Hello, > > > > I'd like to know if there is a way to fit a Structural equation model > with > dichotomous indicators (ex: problem with a phone solved/ or not) > having > effects on a ordinal variable. > > How I do that using R? > > Do you have an example with the code in R that you can send to me? > > > > Thanks a lot! > > Renata Estrella > > UFRJ, Brasil, Rio de Janeiro > > > > > > Renata Leite Estrella > > Assistente de Pesquisa > > (21) 3978-8888 Ramal 8841 > > www.lipe.com.br > > > > > [[alternative HTML version deleted]] > > ______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html -------------------------------- John Fox Department of Sociology McMaster University Hamilton, Ontario, Canada http://socserv.mcmaster.ca/jfox/ ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
