Try this:
boxplot(as.matrix(data) ~ as.Date(date), cex.axis = 0.5, las = 2)
or if all the dates are in the same year and month as they are here
then you might want to just display the day of the month:
boxplot(as.matrix(data) ~ month.day.year(date)$day)
On Sun, May 31, 2009 at 1:45 PM, Ken
Hi,
I'm having trouble using dates (created using library(chron)) as
groupings for a boxplot. I have 10 repeat measurements of a variable
within an individual day. The measurements were done over 10 days. I
would like to plot the measurements as a box and wisker plot (using
boxplot or someth
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