ANOVA with correlated errors
Hi Jose The function likfit() in the package geoR will fit those models. Actually there is a data-set in the package with a similar structure see: require(geoR) data(hoef) help(hoef) best P.J.
On Thu, 13 May 2004, Jose A. Hernandez wrote:
Dear R colleagues, My name is Jose Hernandez and work in the analysis of on-farm experiments. I've been a R user for sometime now, however am still struggling figuring out some of my spatial analysis using R. Most of my experiments have the following model: Y_ij = Mu + r_i + T_j + e_ij Where: r_i is some replication and T_j some fixed treatment effect. I many cases there is significant within block heterogeneity and therefore I can't assume that e_ij are iid. An alternative is to use: Y_ij = Mu + T_j + e_ij And assume that: e_ij follows some spatial covariance model such as exponential, spherical, etc. Are there any R packages that will integrate spatial variability into the model ? Thanks and advance and best regards ! Jose -- Jose A. Hernandez Ph.D. Candidate Precision Agriculture Center Department of Soil, Water, and Climate University of Minnesota 1991 Upper Buford Circle St. Paul, MN 55108 Ph. (612) 625-0445, Fax. (612) 625-2208
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