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

Geoscience Letters

Official Journal of the Asia Oceania Geosciences Society (AOGS)

Table 1 Thresholds of correlation coefficient r used for the gradation of significance level of the periodic component in hydrologic time series

Significance level	No	Weak	Moderate	Strong	Dramatic
Correlation coefficient	\(0 \le \left\| r \right\| < r_{\alpha }\)^a	\(r_{\alpha } \le \left\| r \right\| < r_{\beta }\)^a	r_α ≤ \|r\| < 0.6	0.6 ≤ \|r\| < 0.8	0.8 ≤ \|r\| ≤ 1