 Usage:  {red,redm}=redun(b,sk,lk,skl,y)  
 
 Input:

  b                      a matrix with loadings 
                         
  sk                     a matrix with path coefficients 
                         
  lk                     a matrix with latent variables 
                         
  skl                    a matrix with lagged path coefficients 
                         
  y                      a matrix with manifest variables (indicators) 
                         
 Output:

  red                    a scalar with single redundance value 
                         
  redm                   a vector with redundace values 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
