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In Tableau, there are two common methods
of counting 'Items' (for example Customer IDs)
in calculated 'Bins' (fe Status Change groups).
One is using Table Calculations, the other is with LODs.
I've used the former here (in the attached workbook).
For the latter please refer to this TWL article
(by yours truly, hence a shameless plug :-)
and the excellent step-by-step tutorial by David Taylor:
Hope it could help a bit.