[R] gnls for negative autocorrelation?

Seth sjmyers at syr.edu
Tue Apr 13 07:20:25 CEST 2010


I have data with negative spatial autocorrelation at short lags.  It is well
described by a spherical model, but flipped upside from what is normally
seen.  It seems that gnls will work with this correlated residual type IF
one parameter in the spherical model can be negative (it is usually
positive).  Does anyone know if this parameter is constrained to be
positive? -seth
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