Hi Marco, I'm no expert on this area, but a quick read indicates that this refers to a variety of approaches. One main point is that Tobler and others suggest that the regression is separable into two functions. That is, the goal is to determine the mapping of a set of (x,y) into a set of (u,v), and these can be separated: u = f(x,y) v = g(u,v)
This is a standard problem in rectification, and depending on what assumptions you are willing to make (e.g. are f and g independent? Is the relationship linear?) a wide array of methods present themselves. The Tobler paper(s) and others identify a number of these. I thought the Friedman & Kohler paper (Psych Methods 8(4) 468-491) was very clear on some implementation issues; if you are somewhat comfortable with matrices and R scripting you can probably develop this pretty quickly yourself. The Friedman & Kohler paper is here: http://www.psych.ualberta.ca/%7Ealinda/PDFs/Friedman%20Kohler%20%5B03-Psych%20Methods%5D.pdf Yours, Ashton Shortridge Michigan State University On Wednesday 16 July 2008, Marco Helbich wrote: > Dear list, > > Is there a package available, which computes the "bidimemsional > regression"? For literature see e.g. > > Tobler, W: Bidimensional Regression, Geographical Analysis, 26: 186-212. > > Friedman, A; Kohler, B 2003: Bidimensional regression: A method for > assessing the configural similarity of cognitive maps and other > two-dimensional data. Psychological Methods, B, 468-491 > > I appreciate every hint! > > Best regards > Marco Helbich > > _______________________________________________ > R-sig-Geo mailing list > [email protected] > https://stat.ethz.ch/mailman/listinfo/r-sig-geo _______________________________________________ R-sig-Geo mailing list [email protected] https://stat.ethz.ch/mailman/listinfo/r-sig-geo
