Statistical analysis of a text reveals its properties not seen with the naked eye. Just by counting the occurrences of different letters we can determine the language. More information is obtained by studying correlations of letters, i.e., the occurrences of pairs and triplets of letters. Statistical properties are instrumental in developing compression algorithms. The main idea behind these algorithms is the substitution of a shorter ‘code’ for a letter or combination of letters that occur more frequently, while rare letters are assigned a longer code.
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