Metrics for Syntactic Complexity of a sentence (the values in braces indicate the corresponding value for the tree in Figure 1).
| Syntactic Complexity . | Explanation . |
|---|---|
| tree depth | the depth of the deepest node {3} |
| tree length | number of nodes {8} |
| mean dependency distance | average distance between a head and a dependent. For a dependency linking two adjacent nodes, the distance is equal to one (e.g., nsubj in Figure 1). {(1 + 2 + 1 + 4 + 1 + 2 + 3)/7 = 2} |
| mean flux size | average flux size of each inter-word position {(1 + 1 + 2 + 1 + 2 + 3 + 4)/7 = 2} |
| mean flux weight | average flux weight of each inter-word position {(1 + 1 + 1 + 1 + 1 + 1 + 1)/7 = 1} |
| mean arity | average number of direct dependents of a node {(0 + 2 + 0 + 2 + 0 + 0 + 0 + 3)/8 = 0.875} |
| projectivity | True if the sentence has a projective parse tree (there are no crossing dependency edges and/or projection lines) {True} |
| Syntactic Complexity . | Explanation . |
|---|---|
| tree depth | the depth of the deepest node {3} |
| tree length | number of nodes {8} |
| mean dependency distance | average distance between a head and a dependent. For a dependency linking two adjacent nodes, the distance is equal to one (e.g., nsubj in Figure 1). {(1 + 2 + 1 + 4 + 1 + 2 + 3)/7 = 2} |
| mean flux size | average flux size of each inter-word position {(1 + 1 + 2 + 1 + 2 + 3 + 4)/7 = 2} |
| mean flux weight | average flux weight of each inter-word position {(1 + 1 + 1 + 1 + 1 + 1 + 1)/7 = 1} |
| mean arity | average number of direct dependents of a node {(0 + 2 + 0 + 2 + 0 + 0 + 0 + 3)/8 = 0.875} |
| projectivity | True if the sentence has a projective parse tree (there are no crossing dependency edges and/or projection lines) {True} |