[R] plotting huge data

[Frank E Harrell Jr]

gauravbhatti wrote:
> 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.
> Gaurav

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

-- 
Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University