RETAIN ONLY THE PATTERNS MATCHING A THE PRECISION OF THE PATTERNS O...

6. Retain only the patterns matching a The precision of the patterns obtained sufficient number of examples (we choose the number of examples > 5). from one QA-pair example in algorithm 1 is calculated from the documents obtained in We obtain a table of regular expression algorithm 2 for other examples of the same question type. In other words, the precision patterns for a given question type, along with scores are calculated by cross-checking the the precision of each pattern. This precision patterns across various examples of the same is the probability of each pattern containing the answer and follows directly from the type. This step proves to be very significant principle of maximum likelihood estimation. as it helps to eliminate dubious patterns, For BIRTHDATE the following table is which may appear because the contents of two or more websites may be the same, or the obtained: