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, if S > 0,
- Z = 0
, if S = 0
, if S < 0,
Slope
In classical MannKendall tests Slope is the median of the slopes which is a very reliable estimator of the slope even when there are lots of missing values. The calculation of this value is expensive in terms of memory and requires N * (N-1) / 2 memory where N is the number of non-missing input values. In order to prevent memory problems, it is recommended that a limited amount of input values is used. If the option logSensSlope is set to false, the average slope is used to estimate the slope which is less accurate than the median but requires N memory.
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