Table 4 Wet and dry classifications based on the CCDI.

From: Analysis of the spatial and temporal evolution of drought in Henan based on a nonlinear composite drought index

Type of change

Hurst

Slope

Dry to wet

 < 0.5

 < 0

Persistent drought

 > 0.5

 < 0

Wet to dry

 < 0.5

 > 0

Persistent wetting

 > 0.5

 > 0

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