

corClasses(nlme)                             R Documentation

_C_o_r_r_e_l_a_t_i_o_n _S_t_r_u_c_t_u_r_e _C_l_a_s_s_e_s

_D_e_s_c_r_i_p_t_i_o_n_:

     Standard classes of correlation structures
     (`corStruct') available in the `nlme' library.

_V_a_l_u_e_:

     Available standard classes:

  corAR1: autoregressive process of order 1.

 corARMA: autoregressive moving average process, with arbi-
          trary orders for the autoregressive and moving
          average components.

 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 quadratics spatial correlation.

corSpher: spherical spatial correlation.

 corSymm: general correlation matrix, with no additional
          structure.

_N_o_t_e_:

     Users may define their own `corStruct' classes by spec-
     ifying 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'.

_A_u_t_h_o_r_(_s_)_:

     Jose Pinheiro and Douglas Bates

_S_e_e _A_l_s_o_:

     `corAR1', `corARMA', `corCAR1', `corCompSymm', `cor-
     Exp', `corGaus', `corLin', `corRatio', `corSpher',
     `corSymm'

