[R] Plotting two qqnorm plots:

[njhuang86]

Hi all,

Does anyone know how to plot overlapping qqnorm plots on the same window?
Suppose I have data in the vector x and y:

qqnorm(x)
lines(qqnorm(y))

I though these two lines will do the job... However, lines doesn't seem to
work. Anyways, thanks in advance!
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