The underlying data contained values that resulted in Factor instead of number fields during the read.csv. Problem fixed!
I also introduced a typo while copying the error into my message, and as for the poor variable naming, I'll be more careful. Thanks x3! Corrected structure: > str(CPU) 'data.frame': 56470 obs. of 8 variables: $ Value : num 2.91 9.10e-01 1.08e+07 3.88e+06 3.03 ... $ Timestamp : Factor w/ 4835 levels "9/17/2010 15:30",..: 1 1 1 1 2 2 2 2 3 3 ... $ MetricId : Factor w/ 5 levels "cpu.usage.average",..: 1 1 4 4 1 1 4 4 1 1 ... $ Unit : Factor w/ 4 levels "%","count","KB",..: 1 1 3 3 1 1 3 3 1 1 ... $ Entity : Factor w/ 2 levels "system1",..: 2 1 2 1 2 1 2 1 2 1 ... $ EntityId : Factor w/ 3 levels "","EI1",..: 2 3 2 3 2 3 2 3 2 3 ... $ IntervalSecs: int 1800 1800 1800 1800 1800 1800 1800 1800 1800 1800 ... $ Instance : Factor w/ 1 level "": 1 1 1 1 1 1 1 1 1 1 ... > Hi Steve, > > The basic problem (as the error suggests) is that data of class > "factor" is not allowed in quantile.default. So one of the elements > of your list must be a factor. What are the results of: str(t) ? > As a side note, since t() is a function, using t as a variable name > can be a bit confusing. > > If your list is relative small, you could post the results of dput(t) > which would allow us to see what your data is actually like and > perhaps identify the exact problem and offer a solution. > > Cheers, > > Josh > > > On Tue, Sep 28, 2010 at 5:56 PM, Steve <n...@ittibitti.org> wrote: >> A list (t) that I'm trying to pass to quantile() is causing this error: >> >> Error in  quantile.default(t, probs = c(0.9, 9.95, 0.99)) >>  factors are not allowed >> >> I've successfully use lists before, and am having difficulty finding my >> mistake.  Any suggestions appreciated! >> >> -Steve >> >> ______________________________________________ >> 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. >> > > > > -- > Joshua Wiley > Ph.D. Student, Health Psychology > University of California, Los Angeles > http://www.joshuawiley.com/ > ______________________________________________ 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.