The Average silhouette method is one of the most commonly used methods for determining the optimal number of clusters. It would useful to have the silhouette coefficient in the k-means and AHC outputs. An alternative method is the Gap statistic.

It would be very helpful if we could get 95% CI of the Sen's slope in Seasonal Mann-Kendall option. With my opinion, I think more option will be let the software much more flexible (such as calculate the seasonal Mann-Kendall test with more than 1...

At the moment I cannot see whether a paired analysis has been made, yet this is important to know.

visualization of models