search for: stats787

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2009 Jan 24
2
Plotting Two Lines
Hi, I am trying to plot the following data such that both variable y and z vs x. (ie two lines on a single plot). As the x variable is not numeric, how do I go about it? Appreciate if any expert could help. I know I use plot() follow by lines() to add another line to the plot. But my problem is i was unable to plot y vs x in the first place. x y z D9S1820