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
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