Spatiotemporal Variations of Drought in the Arid Region of Northwestern China during 1950–2012

Table 2

Trend analysis and Sen + M-K trend analysis of the SPI, SPEI, and SC-PDSI.

Drought index	Propensity rate (/10 a)	Sen + M-K trend analysis
		β	|Zc|	Trend
SPI	0.08	0.001 > 0	>1.96	↑
SPEI	0.07	0.001 > 0	>1.96	↑
SC-PDSI	0.19	0.002 > 0	>1.96	↑

^∗0.05 significance level.