Hi Chris, To get a single value you might need something like a Mantel test, available in both ecodist and vegan. That test is a permutation test of significance of the correlation between two distance matrices.
Sarah On May 6, 2012, at 8:06 AM, Christopher Kurby <kur...@gvsu.edu> wrote: > Hey Josh (and everyone), > > My apologies, let me be more specific. I have two sets of XY coordinates in > Cartesian space. I would like to compute a correlation between the two sets. > For example, let's say I have two N X 2 matrices, with the first column being > the X coordinate, the second column being the Y, and with each row being a > new observation. I would like to know the strength the relationship between > the two sets of coordinates (matrices). cancor provides two separate > correlations, but I want a single value representing the strength of the > relationship. Is this more clear? > > Chris > > On May 5, 2012, at 11:44 PM, Joshua Wiley wrote: > >> Hi Chris, >> >> As Jeff mentioned, it is hard to tell what you want (correlations >> between sets of coordinates could mean many things it seems like to >> me), but here is something that perhaps helps: >> >> ## some data (usually nice if you provide this rather than us having >> to make something up) >> d1 <- cbind(x <- rnorm(100), y <- rnorm(100)) >> d2 <- cbind(x2 = x + rnorm(100), y2 = y + rnorm(100)) >> >> ## canonical correlation of the two matrices >> cancor(d1, d2) >> >> ## simple correlation matrix of each dataset >> cor(d1) >> cor(d2) >> >> Cheers, >> >> Josh >> >> On Sat, May 5, 2012 at 5:32 PM, Christopher Kurby <kur...@gvsu.edu> wrote: >>> Hello r world, >>> >>> Does anyone know a function or package that can compute correlations >>> between sets of XY coordinates? >>> >>> Thanks in advance for your help, >>> Chris >>> >>> ______________________________________________ >>> R-help@r-project.org mailing list >>> https://stat.ethz.ch/mailman/listinfo/r-help >>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html >>> and provide commented, minimal, self-contained, reproducible code. >> >> >> >> -- >> Joshua Wiley >> Ph.D. Student, Health Psychology >> Programmer Analyst II, Statistical Consulting Group >> University of California, Los Angeles >> https://joshuawiley.com/ > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
