Thank you: works like a charm. Paul > -----Original Message----- > From: Prof Brian Ripley [mailto:[EMAIL PROTECTED] > Sent: Tuesday, August 24, 2004 2:28 AM > To: Paul Boutros > Cc: R-Help > Subject: Re: [R] Boxplot across levels of a factor > > > On Tue, 24 Aug 2004, Paul Boutros wrote: > > > Hello, > > > > I have a data-frame in which one-column is a factor: > > > > > str(data); > > `data.frame': 194 obs. of 8 variables: > > $ Type : Factor w/ 3 levels "Nuclear-Rec..",..: 1 2 2 > 2 2 2 2 2 2 2 > > ... > > $ Locus : num 0.000571 0.004000 0.001429 0.004857 0.007429 ... > > > > And I'd like to make a boxplot of the data$Locus values, where > each level of > > the factor gets its own box-and-whiskers plot. I'm weak in R, > but I thought > > there might be some shortcut to automating this instead of just > creating a > > new data-structure with all the separate values? > > There are two. The simpler is > > boxplot(Locus ~ Type, data=data) > > and you can also use > > with(data, boxplot(split(Locus, Type))) > > (split() does automate the construction of a suitable data structure.) > > -- > Brian D. Ripley, [EMAIL PROTECTED] > 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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