Description Format Note Source
Hypothetical population of numbers of frogs on lakes as determined by call and visual methods.
A data frame with 1000 observations on the following 2 variables:
Abundance determined from the ‘call’ method.
Abundance determined from the ‘visual’ method.
Data were randomly determined using the following code:
require(MASS) round(mvrnorm(n=1000,c(120,225),matrix(c(25,18,18,35),2,2),empirical=TRUE),0)
Randomly determined from realistic values provided by the Sigurd Olson Environmental Institute, Northland College, Ashland, WI.
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