This solves part of my problem with the independent ordinal variables, but my dependent variable is truly categorial (illness/no illness). Polychoric correlation implies that data are continuous, which in not the case. Is possible to implement logistic regression in the path model?
Thanks, Manel Salamero ---------- Original Message ---------------------------------- De: "John Fox" <[EMAIL PROTECTED]> Data: Sat, 13 Aug 2005 19:35:24 -0400 Dear Manel, > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > SALAMERO BARO, MANUEL > Sent: Saturday, August 13, 2005 2:02 PM > To: [email protected] > Subject: [R] path analysis > > Someone knows if it is possible to perform a path analysis > with sem package (or any other) to explain a dependent > *dichotomus* variable? > Yes -- you can use the hetcor() function in the polycor package to generate a correlation matrix and boot.sem() in the sem package to get standard errors or confidence intervals. Make sure that the dichotomous variables are represented as factors. See ?boot.sem for an example. I hope this helps, John ______________________________________________ [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
