If the output value has a significant trend, the Tau–Kendall value is used to check if it is an increasing (τ > 0) or a descending trend (τ < 0).
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The sentences
The results of these methods can be categorized into four possibilities: a nonsignificant increasing trend (NSIT), which shows an increasing trend that is not statistically significant; a nonsignificant decreasing trend (NSDT), which shows a decreasing trend that is not statistically significant; a significant increasing trend (SIT), which is statistically significant with a trend to increase; and a significant decreasing trend (SDT), which is statistically significant and has a trend to decrease.