[R] Unable to run smoother in qplot() or ggplot() - complains about knots

[hadley wickham]

On Thu, Mar 12, 2009 at 5:37 PM, Christopher David Desjardins
<cddesjardins at gmail.com> wrote:
> I get the following error when I run qplot()
>
> qplot(grade, read,data = hhm.long.m, geom = c("point", "smooth"))
>
> Error in smooth.construct.cr.smooth.spec(object, data, knots) :
>  x has insufficient unique values to support 10 knots: reduce k.
>
> I am not sure how to tackle this problem. When I take a subsample (< 1000)
> than I am able to run that function but with my sample of ~  40,000 qplot
> gives me that error. I have 6 grades.

You have 6 values on the x-axis?  Maybe you want to just calculate the
mean at each grade.  If so, see
http://had.co.nz/ggplot2/stat_summary.html

Hadley

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