 Usage:  res = ssr(cs, node)  

 

 Input:



  cs                     list of vectors: data structure which represents a binary tree 

                         and is produced by cartsplit procedure, contains vectors 

                         cs.val, cs.vec, cs.mean, cs.ssr, cs.nelem. 

                         See cartsplit for the description of cs. 

                         

  node                   integer >= 1: gives the index of the root node of 

                         the subtree whose mean of squared residuals 

                         will be calculated. 

                         If node=1, the mean of squared residuals in the hole tree is 

                         calculated, if node=2, the mean of squared residuals in the 

                         left subtree is calculated, if node=3, the mean of squared 

                         residuals in the left subtree of the left subtree 

                         (if it exists) is calculated. See cartsplit for 

                         the explanation how the tree is represented as a 

                         vector. 

                         

 Output:



  res                    real number >= 0: sum of squared residuals in the specified 

                         subtree. 

                         

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(C) MD*TECH Method and Data Technologies, 21.9.2000

