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.BG
.FN corClasses
.TL
Correlation Structure Classes
.DN
Standard classes of correlation structures (`corStruct')
available in the `nlme' library.
.RT
Available standard classes:
.AG corAR1
autoregressive process of order 1.
.AG corARMA
autoregressive moving average process, with arbitrary
orders for the autoregressive and moving average components.
.AG corBand
banded correlation structure.
.AG corCAR1
continuous autoregressive process (AR(1) process for a
continuous time covariate).
.AG corCompSymm
compound symmetry structure corresponding to a
constant correlation.
.AG corExp
exponential spatial correlation.
.AG corGaus
Gaussian spatial correlation.
.AG corLin
linear spatial correlation.
.AG corRatio
Rational quadratics spatial correlation.
.AG corSpher
spherical spatial correlation.
.AG 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 classes `corSymm'
and `corAR1'.
.SA
`corAR1', `corARMA',
`corBand', `corCAR1', `corCompSymm',
`corExp', `corGaus', `corLin',
`corRatio', `corSpher', `corSymm'
.KW models
.WR
