[R] Plotting multiple time series with variables having different units

Rolf Turner r.turner at auckland.ac.nz
Sun Feb 2 21:35:19 CET 2014

Just ***DON'T***!!! Very bad idea; usually wildly misleading.
See, e.g.:


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***!!!


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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