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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