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2011 Nov 22
0
Help to inputting a pre-defined correlation structure in a Mixed Model
...th the reladness coefficients (kinship) between all individuals in the study. The K matrix is calculated outside of R environment, and I'm using it as an input. I'm using the lme function of the nlme library in R, but I want to know how can I gap the structures that R offers me (as corrAR1, corrSumm, etc.) as default structures, because I already have this structure and I only have to estimate the (sigma g)^2 parameter, possibly using REML. I'm new in the use of mixed models and I will be very pleased if someone could help me with this particular question. Thanks a lot in advance. -- Vie...