Standard classes of correlation (
corStruct) structures available in the
nlme3 library.
VALUE:
Available standard classes:
corAR1
autoregressive process of order 1
corARMA
autoregressive moving average process, with arbitrary orders for the autoregressive and moving average components
corBand
banded correlation structure
corCAR1
continuous autoregressive process (AR(1) process for a continuous time covariate)
corCompSymm
compound symmetry structure corresponding to a constant correlation
corExp
exponential spatial correlation
corGaus
Gaussian spatial correlation
corLin
linear spatial correlation
corRatio
rational quadratic spatial correlation
corSpher
spherical spatial correlation
corStrat
stratified correlation structure
corSymm
general correlation matrix, with no additional structure
NOTE:
Users may define their own
corStruct classes by specifying a
constructor function, and at a minimum, methods for the functions
corMatrix and
coef. For examples of these functions, see the methods for the
corSymm and
corAR1 classes.