Calculate a Mann-Whitney-Wilcoxon test for a difference between treatment
levels using nested ranks. This test can be used when observations are
structured into several groups and each group has received both treatment
levels. The p-value is determined via bootstrapping. This test is intended
to be analogous to a mixed-model extension of the
for which treatment is a fixed effect and group membership is a random
The main function is
nestedRanksTest, which includes a
formula interface implementing the familiar
"|" syntax for
specifying group membership on the right-hand side of the formula.
The value returned is a list of class
are provided to print and visualise results.
These statistical tools were developed in collaboration with Peter E. Smouse (Rutgers University) and Victoria L. Sork (UCLA) and were funded in part by U.S. National Science Foundation awards NSF-DEB-0514956 and NSF-DEB-0516529.
Thompson, P. G., Smouse, P. E., Scofield, D. G. and Sork, V. L. (2014) What seeds tell us about birds: a multi-year analysis of acorn woodpecker foraging movements. Movement Ecology 2:12. http://www.movementecologyjournal.com/content/2/1/12
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