Recently Hu, Tung, Gao, and Cao [Phys. Rev. E 72, 056207 (2005)] investigated the 0-1 test for chaos. By looking at random data and at data stemming from the one-dimensional logistic map they concluded that the test is unreliable. We explain why their criticism is unfounded.
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Gottwald et al. (2008) studied this question.
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