[R] problem using "rank"
Prof Brian Ripley
ripley at stats.ox.ac.uk
Fri Aug 17 19:27:57 CEST 2007
On Fri, 17 Aug 2007, Jiong Zhang, PhD wrote:
> Hi All,
> I had 12766 elements in a column, 12566 are values and 200 are "NA"s. I
> used the following line to get the ranks:
> total_list$MB.rank <- rank(-total_list$MB,ties.method="min",na.last=NA)
> but I got an error message:
> Error in `$<-.data.frame`(`*tmp*`, "BCRP_PW_F.rank", value = c(3949, 6182, :
> replacement has 12199 rows, data has 12766
> What shall I do to keep the "NA"s as "NA"s? thanks a lot.
If all else fails try reading the help! You have to select the right
option for na.last, and yours is not it. I suspect you want
na.last="keep", but only you know what you mean.
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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