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    "text": "The block frequency test's statistic is χ²(obs) = 4M Σ(πi − 1/2)², referred to a χ² distribution with N degrees of freedom (SP 800-22 rev 1a §3.2, p. 64)."
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      "text": "SP 800-22 rev 1a §3.2 (p. 64), verbatim: \"The parameters of this test are M and N , so that n = MN , i.e., the original string is partitioned into N substrings, each of length M .\"",
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      "text": "SP 800-22 rev 1a §3.2 (p. 64), verbatim: the statistic \"under the randomness hypothesis has the Χ 2 -distribution with N degrees of freedom\"; the formula line carries the factor 4M.",
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