[R] spatial autocorrelation for data that are temporally pseudoreplicated

2011-02-04 Thread Gagic, Vasna
Dear all, I collected my data from the different agricultural fields every week over a period of a month. how can I test for spatial autocorrelation in R with data that are temporally pseudoreplicated? I used lme with correlation=corCompSymm(form=~Date) to model temporal pseudoreplication.

[R] Spatial Autocorrelation

2009-10-06 Thread P.Branco
Hello, I have a matrix with the distances among sites. And I have another matrix with the presence and absence of each species in each site. I would like to test the spatial autocorrelation among sites. I have tried to use the function gearymoran of the ade4 package, but error messages keep

Re: [R] Spatial Autocorrelation

2009-10-06 Thread anna freni sterrantino
Anna Anna Freni Sterrantino Ph.D Student Department of Statistics University of Bologna, Italy via Belle Arti 41, 40124 BO. Da: P.Branco pjlbra...@yahoo.com A: r-help@r-project.org Inviato: Martedì 6 ottobre 2009, 13:28:36 Oggetto: [R] Spatial

Re: [R] Spatial Autocorrelation

2009-10-06 Thread Corey Sparks
Department of Statistics University of Bologna, Italy via Belle Arti 41, 40124 BO. Da: P.Branco pjlbra...@yahoo.com A: r-help@r-project.org Inviato: Martedì 6 ottobre 2009, 13:28:36 Oggetto: [R] Spatial Autocorrelation Hello, I have a matrix

Re: [R] Spatial Autocorrelation

2009-10-06 Thread spencerg
Anna Anna Freni Sterrantino Ph.D Student Department of Statistics University of Bologna, Italy via Belle Arti 41, 40124 BO. Da: P.Branco pjlbra...@yahoo.com A: r-help@r-project.org Inviato: Martedì 6 ottobre 2009, 13:28:36 Oggetto: [R] Spatial

[R] Spatial autocorrelation

2007-10-22 Thread Geertje Van der Heijden
Hi, I have collected data on trees from 5 forest plots located within the same landscape. Data within the plots are spatially autocorrelated (calculated using Moran's I). I would like to do a ANCOVA type of analysis combining these five plots, but the assumption that there is no autocorrelation

Re: [R] Spatial autocorrelation

2007-10-22 Thread Thibaut Jombart
Geertje Van der Heijden wrote: Hi, I have collected data on trees from 5 forest plots located within the same landscape. Data within the plots are spatially autocorrelated (calculated using Moran's I). I would like to do a ANCOVA type of analysis combining these five plots, but the assumption

Re: [R] Spatial autocorrelation

2007-10-22 Thread Julian Burgos
Hi Geertje, You should look into linear mixed-effects models. In these you can incorporate spatial correlation explicitly. The basic function to use is lme(), but you should do some reading about this type of models before jumping into it. An excellent resource is the book Mixed Effects