Daniel Kupka (Clay) & Gui Stetelle thanks for your insights, I dare to say these do not address the issue 🙂 now bear with me I will explain why.
the change in employee number is not retention. there may be no change in # employees QoQ or YoY, whilst the churn may be enormous (or none, for that matter).
So i was thinking along these lines:
find employees who worked for this company before but are not with it any more
find out when they left the company
use it to calculate empl. turnover
now, this has obvious limitations, as it makes no economic sense to inspect potentially hundreds of contacts to get just one number.
hence my question,
opinions welcome :)