logDet.corStruct            package:nlme            R Documentation

_E_x_t_r_a_c_t _c_o_r_S_t_r_u_c_t _L_o_g-_D_e_t_e_r_m_i_n_a_n_t

_D_e_s_c_r_i_p_t_i_o_n:

     This method function extracts the logarithm of the determinant of
     a square-root factor of the correlation matrix associated with
     'object', or the sum of the log-determinants of square-root
     factors of the list of correlation matrices associated with
     'object'.

_U_s_a_g_e:

     ## S3 method for class 'corStruct':
     logDet(object, covariate, ...)

_A_r_g_u_m_e_n_t_s:

  object: an object inheriting from class 'corStruct', representing a
          correlation structure.

covariate: an optional covariate vector (matrix), or list of covariate
          vectors (matrices), at which values the correlation matrix,
          or list of correlation  matrices, are to be evaluated.
          Defaults to 'getCovariate(object)'.

     ...: some methods for this generic require additional arguments. 
          None are used in this method.

_V_a_l_u_e:

     the log-determinant of a square-root factor of the correlation
     matrix associated with 'object', or the sum of the
     log-determinants of square-root factors of the list of correlation
     matrices associated with 'object'.

_A_u_t_h_o_r(_s):

     Jose Pinheiro Jose.Pinheiro@pharma.novartis.com and Douglas Bates
     bates@stat.wisc.edu

_S_e_e _A_l_s_o:

     'logLik.corStruct', 'corMatrix.corStruct'

_E_x_a_m_p_l_e_s:

     cs1 <- corAR1(0.3)
     logDet(cs1, covariate = 1:4)

