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Do you mean when to compare to a t-distribution as opposed to a standard normal distribution? That is because, in the former case, you have to estimate the standard deviation. Chugging through the theory gives you that you compare to $t$, not standard normal. The details of that should be covered in a statistics textbook. The intuition might not be. The way ...


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Lexical cohesion is also called colocation extraction, frequently occurring ngrams. One example is "San Francisco" which occurs more often relative to "San" and "Francisco" appearing independently. One method for colocation extraction is to rank order the occurrence all ngrams and pick a threshold for inclusion. Semantic ...


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