Hello. I'm getting an unexpected result when running smooth.spline(). Here is a simple example that replicates the error I'm getting:
> aa <- c(1, 2, 3, 8, 8, 8, 8, 8, 8, 8, 8, 8, 12, 13, 14) > bb <- 1:length(aa) > plot(aa, bb) > smooth.spline(aa, bb) Error in smooth.spline(aa, bb) : need at least four unique 'x' values As you can see from the example, my 'x' clearly has more than 4 values. The problem is the form of my 'x'. When I dig around in the smooth.spline() code, it looks like it is relying on a call to IQR(x) which, with data such as the object aa above, returns 0 because more than half of the values are stacked on one value in the middle of the data. The call to smooth.spline() works if I add some random noise to the Xs, but I'd like to be able to avoid that type of workaround. Any other suggestions? Thanks, Nick -- Nicholas G. Reich, Ph.D. Research Assistant Professor Division of Biostatistics and Epidemiology School of Public Health and Health Sciences University of Massachusetts, Amherst 413.545.4534 n...@schoolph.umass.edu http://people.umass.edu/nick/ on twitter: @reichlab ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
