With the below commands:
plot(nktr118pk$DV,nktr118pk$IPRE, type='p',cex=0.9,xlab='Observed',ylab='Individual Predicted',xlim=c(0.01,10000),ylim=c(0.01,10000),col=2,log='xy')
abline(0,1,lwd=3,col=5)
abline function does't work!
thanks a lot! I am using TIBCO SPOTFIRE S+ 8.1.