[R] why won't rq draw lines?

From: <david_foreman_at_doctors.org.uk>
Date: Mon 19 Jul 2004 - 23:53:05 EST


I've been trying to draw quantile linear regression lines across a scatterplot of my data using

attach(forrq)

     plot(PREGNANT,DAY8,xlab="pregnant EPDS",ylab="postnatal EPDS",cex=.5)
     taus <- c(.05,.1,.25,.75,.9,.95)
     xx <- seq(min(PREGNANT),max(PREGNANT),100)
     for(tau in taus){
             f <- coef(rq(DAY8~PREGNANT,tau=tau))
             yy <- (f[1]+f[2]*xx)
             lines(xx,yy)
             }

which is simply the method from the help file with my dataset attached, and the variable names substituted where appropriate. I get the scatterplot, but no lines. Any ideas about what's going on? or wrong?

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