I think the previous answer (to use lm() ) is not necessarily the best
option.
Since what you want is the definite integral (area under the curve), you
can just use one of the existing definite integration tools (sorry, I
don't recall the names because I don't use them).
If you want to get a "smoothed" curve to remove errors in your data
points, I'd recommend fitting a spline and integrating under that.
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