I am looking to identify the inflection point in a clear threshold relationship between the site-level density of two trout species that occupy similar niches. It appears to me that a two-dimensional Kolmogorov-Smirnov test (specifically the version published by Fasano and Franceschini 1987 and popularized by Garvey et al. 1998) is the best way to do this (although I appreciate other suggestions), however to the best of my knowledge the only available implementations are coded in Matlab, Python, C, etc.
My question, simply put, is: does such an implementation exist in R? If not, what implementation would you recommend to someone with little coding experience outside of R?
Any help or feedback is very much appreciated!
Works cited: Fasano, Giovanni, and Alberto Franceschini. "A multidimensional version of the Kolmogorov–Smirnov test." Monthly Notices of the Royal Astronomical Society 225.1 (1987): 155-170.
Garvey, James E., Elizabeth A. Marschall, and Russell A. Wright. "From star charts to stoneflies: detecting relationships in continuous bivariate data." Ecology 79.2 (1998): 442-447.
I believe the attached Google search will solve your problem. Best wishes, David Booth
Sorry forgot to mention that you must scroll down farther to find fasano test but it's there. D. Booth
Unfortunately, I wasn't able to find it either. The consensus on Stack Exchange is that one doesn't exist for R (specifically, Fasano and Franceschini's version), which is amazing to me given the potential applications.
Hey Nicholas Voss, seems like you were correct that an R implementation of the Fasano and Franceschini test didn't exist. The other packages mentioned above are for the more computationally expensive Peacock test (1983).
I've previously written a package as part of my research and have turned it into an R package that is now on CRAN.
R code Implementation
The Fasano-Franceschini test (1987) is a 2-D Kolmogorov-Smirnov (KS) two-sample test shown to be a less computationally expensive version of the Peacock test .
https://nesscoder.github.io/fasano.franceschini.test/
R code Implementation Manuscript
Preprint Fasano-Franceschini Test: an Implementation of a 2-Dimension...
Original Paper
Fasano, G. and Franceschini, A. 1987, A Multidimensional Version of the Kolmogorov-Smirnov Test.
Article A multidimensional of the Kolmogorov-Smirnov test
Elan Ness-Cohn,
Thank you for sharing your package -- I'm sure many others will find it as useful as I have!
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