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Official Journal of the Asia Oceania Geosciences Society (AOGS)

Table 6 The time period and the gradation standards of annual runoff and annual precipitation time series in Yangtze River basin (excluding Taihu Lake basin)

From: Correlation-aided method for identification and gradation of periodicities in hydrologic time series

Time period Significance level
1956–2017 0 ≤ |r| < 0.250a 0.250 ≤ |r| < 0.325a 0.325 ≤ |r| < 0.6 0.6 ≤ |r| < 0.8 0.8 ≤ |r| < 1
No (N) Weak (W) Moderate (M) Strong (S) Dramatic (D)
  1. aFor the annual time series with the length of 62 years, the thresholds of correlation coefficient are set as r0.05 = 0.250, r0.01 = 0.325, 0.6 and 0.8 to give five-level assessment