Just ***DON'T***!!! Very bad idea; usually wildly misleading.
See, e.g.:
http://www.perceptualedge.com/articles/visual_business_intelligence/dual-scaled_axes.pdf
OTOH if you're going to be bloody-minded and do it anyway, there are
brazillions of hits from a Google search which will tell you how. But I
repeat: ***DON'T***!!!
cheers,
Rolf Turner
On 03/02/14 08:09, David Parkhurst wrote:
I've tried to figure out how to do this from what I read, but haven't
been successful. Suppose I have a dataframe with variables Date, X, and
Y (and maybe U, V, and Z) where X, Y, etc. have different units. I'd
like to plot Y vs. Time above X vs. Time, above one another.
For example, X is the number of gulls counted on a reservoir, and Y is
the number of coliform bacteria counted on a petri plate from a water
sample leaving the reservoir, so these have very different ranges. U and
V might be numbers of geese and numbers of ducks counted on the same days.
What commands would I use to create such a set of plots?
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