Historic membership numbers over time

Hi all

I'm trying to build a widget that shows how many members we had each month, going back over time, so that we can track the change in total membership numbers month on month.   I feel it's a reasonable request from our memberships team to be able to visualise this data.

In list manager I would do this by adding initiation date < month of interest and expiration dates > month of interest to find all memberships that were active in any specific month.   However, I'm failing to replicate this in analytics, and wondered if anyone has already tackled this?

I've got as far as (with massive thanks to Paul Woods for getting me started)  setting up values for each month, using a formula (SUM([Membership  Count]), [Days in Current Membership Initiation Date], [Days in Current Membership Expiration Date])  and with date filters on the initiation and expiration date.

However the numbers are really wrong (hugely overstated for this year, and much too small for previous years).   I can't find any membership data that isn't Current Membership, which may be part of the problem.

Really hoping that someone can shed some much-needed light.

best wishes

Alison

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