Dear Ricardo, Yes, the least-squares line fit when reg.line=TRUE (the default) includes a constant.
Regards, John -------------------------------- John Fox Senator William McMaster Professor of Social Statistics Department of Sociology McMaster University Hamilton, Ontario, Canada web: socserv.mcmaster.ca/jfox > -----Original Message----- > From: Ricardo Gonçalves Silva [mailto:ricard...@terra.com.br] > Sent: February-11-10 9:26 PM > To: R-Help; j...@mcmaster.ca > Subject: scatterplot in Package CAR > > Hi Folks, > > Please, > > when I ask the option reg.line at the scatterplot in package car, the OLS > models includes a constant? > If not how can I do it sing the following code: > > scatterplot(lfirms ~ lscale, > data=dataset, > reg.line=lm, smooth=FALSE, labels=FALSE, > span=0.5, > xlab="Relative Plant Fixed Cost", > ylab="Relative Number of Firms", > pch=c(18), > boxplots=FALSE, > main = "Relative Number of Firms x Relative Plant Fixed Cost", > pty='s',lty = "solid", las = 1, adj=0.5) > grid(nx = 10, ny = 10, col = "black", lty = "dotted",lwd = par("lwd"), > equilogs = TRUE) > > > A variable, ctt, of ones is in the dataset. > Thanks in advance, > > Rick ______________________________________________ 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.
