Figure 1
From: Novel tree-based method to generate markers from rare variant data
Example tree. An example tree fitted using phenotype Y and a group of SNP variables X1, X2, X3, and X4. X1 and X2 are used as the partitioning variables, yielding three leaf nodes. X1, X2, X3, and X4 are the searched SNPs, and X1 and X2 are the final SNPs used in the tree. The branches of this tree are grouped into two categories depending on the prediction value (case or control) of each leaf node. A bilevel marker is then constructed according to this categorization of branches.