On 1/16/08, Denis Aydin <[EMAIL PROTECTED]> wrote: > Hi, > > I try to make a histogram from a variable that contains the number of > shoots from about 1000 individuals from a specific plant species (the range > is 1-110). > Those numbers are highly skewed to the right.
I would suggest you consider transforming the values first (log or square root would be typical); that might address the problems caused by skewness. > My question is: how can I make my own classes with the lattice > "histogram"? > > I tried it with "breaks=c(0,5,10,15,20,25,110)" but my "25-110"-class is > presented > as one huge bin ranging from 25 to 110. Yes, that's how it's supposed to be in a ``histogram''. > Is there a way to plot this bin in equal size as the others? Yes, but the result is no longer a histogram but a bar plot. You can discretize your data into a factor with appropriate levels using the 'cut' function; e.g. something like xdisc <- cut(x, breaks=c(0,5,10,15,20,25,110)) and then plot it using barchart(table(xdisc)) ## or perhaps barchart(table(xdisc), horizontal=FALSE) > And how is it possible to change the annotation of the x-axis, let's > say the last tick named ">25"? The easiest way is to change the relevant label, e.g. levels(xdisc)[6] <- "> 25" -Deepayan ______________________________________________ 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.
