A time series of 16 years (5 replicates per year) of mayfly (Ephemeroptera:Heptageniidae) abundance in the fall at the monitoring station AR1 on the Arkansas River in Colorado, USA.
A data frame with 90 observations on the following 2 variables.
The year of observation
The Square root of observed abundance.
Sonderegger, D.L., Wang, H., Clements, W.H., and Noon, B.R. 2009. Using SiZer to detect thresholds in ecological data. Frontiers in Ecology and the Environment 7:190-195.
require(ggplot2) data(Arkansas) ggplot(Arkansas, aes(x=year, y=sqrt.mayflies)) + geom_point()
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