Re: [R] negative correlation with corSymm in nlme or another way?

1. Next time you might try emailing the mixed-effects mailing list. 2. Maybe I'm missing some detail about your example, but have you considered corAR1()? Here is an example with negative correlation: library(agridat) dat <- kempton.competition # Fixed genotype effects, random rep effects, # Aut

[R] negative correlation with corSymm in nlme or another way?

Hi, I have a nonlinear model with residuals that are negatively autocorrelated at short distances. I can find no spatial correlation structures in nlme that can easily handle negative autocorrelation as most have bounds on parameter values so that correlation is from 0 to 1. First, is there so