On Sat, May 25, 2013 at 7:09 PM, Amy Henry <amybethhe...@gmail.com> wrote: > Hi, I started using R about 3 months ago so please excuse my ignorance. I > have two datasets. The first consists of 247 fixed position mosquito traps > that were serviced weekly for 23 weeks. The second is dengue incidence data > indexed to home address for the same time period. I would like to see if > there is a space time relationship between mosquito catch rate and dengue > incidence. So far I have been unable to locate a package for multilayer > spatial analysis or a space-time analysis that would answer the question. > Does anyone have advise on where I should look?
Do you have a statistical model in mind? Something like your mosquito count data is noisy samples from an underlying spatio-temporally smooth rate (with some space-time covariance structure), and that your dengue incidence is dependent on that (in some way, perhaps you need cases and controls for a logistic regression). Looks like a spatio-temporal errors-in-variables model. Is it? Maybe you can take a point pattern approach with the cases as an inhomogeneous space-time poisson process with intensity given by the smoothed mosuito measurement data... You need to figure out the stats before you go off fishing for a package. Or are you expecting to be able to plug in your data, crank a handle, and get an answer out? Have you explored the data at all? You could try some simple time series exploratory plots (maybe there's a monthly pattern caused by the moon?) or a few maps of the totals over all time. Ideally you should figure out the stats before you even collect the data... Barry ______________________________________________ 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.