The interesting question which naturally arises at this point is whether the errors we find are the same as those found by the method of variation detection.
we have performed the following experiment: We have counted the numbers of occurrences for the dependencies B  A (the word B is the head of the word A) and C  A (the word C is the head of the word A), where B  A is the dependency proposed by the parsers and C  A is the dependency proposed by the gold standard.