brede_mat_concordance

 brede_mat_concordance - Lin's concordance correlation coefficient

       C = brede_mat_concordance(M1, M2)
       C = brede_mat_concordance(M1)

       Input:  M1   'Mat' structure
               M2   'Mat' structure

       Output: C    Concordance correlation coefficient matrix in a
                    'mat' structure

       Lin's concordance correlation coefficient for two raters. The
       resulting concordance correlation coefficient is returned in a
       matrix where the rows correspond to the columns in the first
       input matrix while the columns correspond to the columns of the
       second input matrix. 
       
       If there is only one input argument then the result is computed
       over all pairs of columns of the first input matrix and returned
       in a symmetric matrix. 

       The variances and covariances are normalized with N rather than
       N-1. 
 
       This function does not handle missing data, and it does not
       handle multiple raters. For the situation with multiple raters
       see the brede_mat_icc function.

       Reference:
         Lawrence I-Kuei Lin (March 1989). "A concordance correlation
         coefficient to evaluate reproducibility". Biometrics 45 (1):
         255-268. PMID 2720055. 

       Example:
         C = brede_mat_concordance(rand(10,2), rand(10,3))
  
       See also BREDE, BREDE_MAT, BREDE_MAT_CORRCOEF, BREDE_MAT_ICC,
                BREDE_MAT_PARTCORRCOEF.

 $Id: brede_mat_concordance.m,v 1.2 2008/02/22 15:48:17 fn Exp $