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Data used in example in list format.
data(testdata)
A data frame with 11 observations on the following 3 variables.
plotname
a factor with levels plot1, plot2, plot3.
plot1
plot2
plot3
species
a factor with levels sp1 to sp7.
sp1
sp7
abundance
a numeric vector indicating number of individuals appeared in each plot.
data(testdata) testdata
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