[R-sig-Geo] spml and logLik, help!

2012-11-04 Thread Ariel Ortiz-Bobea
Hello, I would greatly appreciate some help on this. Any tips are more than welcome. I'm trying to obtain the log-likelihood at the optimum parameter values using spml() from the splm package. The created fit object contains a slot called logLik which is supposed to have that value but I find it

Re: [R-sig-Geo] Problem with categorical variable coefficients and se in glm

2012-11-04 Thread Seth W. Bigelow
Will, if your category UM is all zeros, there can be no variance to it, so I would say that you cannot make any statistical inference about it. Presumably there is no option of collecting more data? Certainly changing one of the data points from zero to one gives a cleaner-looking estimate of

[R-sig-Geo] reboxing with package=gstat

2012-11-04 Thread Tom Roche
Apologies if the following reveals a profound lack of understanding of spatiality or geostatistics (esp kriging), which I'm learning slowly and on-the-fly: summary: for reboxing from a regular global unprojected grid to a regular local projected grid (both 3D), should one use * gstat::krige? If

[R-sig-Geo] reboxing with package=GSIF

2012-11-04 Thread Tom Roche
summary: how to use GSIF::make.3Dgrid for general-purpose reboxing, or 3D interpolation? Particularly, can one use varying vertical bounds rather than the same standard depths for both input and output? details: Apologies if the following questions reveal a profound ignorance of spatiality or

[R-sig-Geo] Spatial autocorrelation

2012-11-04 Thread Ravichandra MONDRETI
Dear all, I have very recently started using R for analysing my spatial data. Is there any way to split the main transect in to smaller ones to check for autocorrelation at various lags or intervals. For example, I am trying to split the main transect (approximately of 20Km in length)