[R] Average of several line plots

[mattnixon]

Hi,

I have several data sets which are all approximately within the same values
as each other (both X and Y) and all of these data sets more or less overlap
each other when plotted on the same graph. However, although each data set
varies between approximately the same range, there are vastly different
numbers of data points within each data set (due to the nature of how these
values had to be measured).

Currently, I am trying to figure out a way to produce a graph showing all
these data sets and a line showing the average of all of the data sets.
Given the different number of data points, I can't think of an easy way to
do this.

Can anybody help?

Thanks!
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