Melanie Murphy <mamurphy <at> turbonet.com> writes: > > I was wondering if anyone has developed (or is developing) an > implementation for gravity models (spatial interaction) in R. I > conducted several searches on the CRAN website with no luck. Currently > I am estimating parameters via linearization.
There isn't anything (yet) in the Spatial task view on CRAN, and I'm not aware of the topic coming up on the R-sig-geo list either. The nearest sign of transport planning is perhaps the emme2 package for interfacing EMME/2 software. As you are aware, there are many almost equivalent ways of fitting gravity models, so many R functions are feasible. But no dedicated functions so far, I'm afraid - if I'm wrong, please let me know, and I'll update the task view. Roger > > Thank you in advance > > Melanie Murphy > ______________________________________________ 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.
