how do you create a histogram with a data frame?
year snow.cover 1970 6.5 1971 12.0 1972 14.9 1973 10.0 1974 10.7 1975 7.9 ...
mydata=data.frame(year=c(1970,...),snow.cover=c(6.5,...))
hist(mydata) does not work.
Many thanks.
PR
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