[R] plotting huge data
Frank E Harrell Jr
f.harrell at vanderbilt.edu
Fri Aug 7 14:19:16 CEST 2009
> I have a data frame with 25000 rows containing two columns Time and Distance.
> When I plot a simple distance versus time plot, the plot is very confusing
> showing no general trend because of the large data. Is there any way I can
> improve the plot by lets say using moving average as in EXCEL ? please also
> suggest some other methods to make the graph smoother and better looking.
I recommend using the quantreg package to fit a quantile regression
model using a spline function of Time. Draw the estimated curves for
selected quantiles such as 0.1 0.25 0.5 0.75 0.9. A new function Rq in
the Design package makes this easier but you can do it with just quantreg.
Frank E Harrell Jr Professor and Chair School of Medicine
Department of Biostatistics Vanderbilt University
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