Permutation MT IR CosShort name: ircos The IR-Cos measure is a standard implementation of the Vector-measure used in Information-Retrieval systems. It uses the vector of the average case as the 'query' and the handed vector as the 'document'. The used formula is (dot product between the query- and the document-vectors) / (sqrt(dot-product of the query with itself) + sqrt(dot-product of the document with itself)) Supports: One p-value, One-weight Usefull for determining the significance of base-cases with resprect to their permutations. Note however that this measure weights often occuring ngrams as much heavier than rare ones (not only skews but in absolute values also). To prevent this the IR-Cos measure should be used with the PermutationDRR- InPermutationNormalizedBetweenPermutationsNormalized normalisation- reader |
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