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| 分组频数 | |||||||
| x1 频数 | ≤ 0 (53,924) | ≤ 1 (70,713) | ≤ 3 (108,458) | ≤ 4 (43,031) | ≤ 12 (266,187) | ≤ 14 (51,632) | ≤ 16 (38,679) | > 16 (36,268) |
| x2 频数 | ≤25 (38,493) | ≤ 40 (233,382) | > 40 (397,017) |
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| x3 频数 | ≤ 51 (393,811) | ≤ 57 (51,936) | ≤ 63 (37,747) | ≤ 68 (42,306) | ≤ 90 (98,784) | > 90 (44,308) |
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| x4 频数 | ≤ 40 (80,784) | ≤ 393 (254,573) | ≤ 526 (34,125) | ≤ 730 (34,786) | > 730 (264,624) |
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