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Using Suffix Arrays to Compute Term Frequency and Document Frequency for All Substrings in a Corpus
Suffix Arrays Compute Term Frequency Document Frequency All Substrings
2015/8/26
Bigrams and trigrams are commonly used in statistical natural language processing; this paper will describe techniques for working with much longer n-grams. Suffix arrays (Manber and Myers 1990) were ...
Feature Selection Based on Term Frequency and T-Test for Text Categorization
feature selection term frequency t-test text classification
2013/6/14
Much work has been done on feature selection. Existing methods are based on document frequency, such as Chi-Square Statistic, Information Gain etc. However, these methods have two shortcomings: one is...
Unprecedented High Long Term Frequency Stability with a Macroscopic Resonator Oscillator
Frequency Stability Resonator Oscillator
2010/11/16
This article reports on the long-term frequency stabilty characterisation of a new type of cryogenic sapphire oscillator using an autonomous pulse-tube cryocooler as its cold source. This new design e...