[R] Moving Averages in ggplot2

[fruminator]

Hello all,

Have some time series data stored in a data.frame, and am plotting it with
ggplot2 (which is totally awesome).  I have explored the documentation and
mailing list archives, and I can't see any way to plot a 'smoother' that is
just the K-step moving average.

For example, imagine I had a data.frame called 'sleep' with 'date' as the
date (from as.Date()) and 'hours' as the # hours I slept that night, I would
love to do something like:

qplot(date, hours, data = sleep) + stat_smooth(method = 'movingaverage', k =
7);

does such a thing exist?  If not, I know the package is extensible, so any
guidance as to how make it to do so would be very much appreciated.

Thanks,
Mike
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