Table 4 Summary of significance test for debris-flow events in six ten-year intervals
From: The nocturnal occurrence of debris flows: evidence from western China
Ten-year interval | Total event N | Nocturnal event X | Calculated frequency p | Standard error SE | 95% confidence interval | Expected frequency p0 | P-value |
|---|---|---|---|---|---|---|---|
1965–1974 | 31 | 17 | 54.8% | 8.9% | [36.0%, 72.7%] | 50.0% | 0.72 |
1975–1984 | 37 | 19 | 51.4% | 8.2% | [34.4%, 68.1%] | 1.00 | |
1985–1994 | 70 | 46 | 65.7% | 5.6% | [53.4%, 76.7%] | 0.01 | |
1995–2004 | 108 | 56 | 51.9% | 4.8% | [42.0%, 61.6%] | 0.77 | |
2005–2014 | 37 | 29 | 78.4% | 6.7% | [61.8%, 90.2%] | 7.53 × 10−4 | |
2015–2023 | 3 | 3 | 100.0% | 0.0% | [29.2%, 100.0%] | 0.25 |
