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Why aren’t they comparing it to parq or even bzip?



Because the author compares to the best domain-specific compressors (by compression ratio) for each dataset instead. For text, he used CMIX[1]. For DNA sequences, he used MFCompress[2].

[1] http://mattmahoney.net/dc/text.html

[2] http://bioinformatics.ua.pt/software/mfcompress/




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