I am having confusion and problem in trend analysis.
Is it possible to perform Mann-Kendall test for trend analysis of 5 years time series data of groundwater level?
Yes, it's not recommended but is possible
why not ,try and interpret
as Tiago Bentes Mandú mentioned, you need a minimum of three records to perform the test. But the record length is too small to produce any useful conclusions.
If you have weekly or monthly observations, you can.
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