PowerPivot - Count the Values that were in a Previous Period but Not in Current Period

I'm working to calculate a Turnover Report. I've got an export of Employee ID's by week and would like to count the number of Employees ID's that did not return from working the previous week.

Basically Count the entries that didn't reoccur.

I've attached a basic version of the file I've started with the data loaded into PowerPivot via a Linked Table along with a Calendar Table.

If you look at the data an example would be that EmployeeID 1158 worked on 11/2/2014, but didn't work on 11/9/2014. I want to be able to count all the various EmployeeID's where this is the case. So the count of Employees that worked in the previous week, but not in the current week. In this example the count would be under Week 11/9/2014.
thomas-sherrouseAsked:
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EirmanChief Operations ManagerCommented:
Try again with the attachment.
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thomas-sherrouseAuthor Commented:
Sorry File attached
TurnoverExample-PowerPivot.xlsx
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Rory ArchibaldCommented:
You could create a new calculated column to show the employee id only for rows where the employee didn't work the following week:
=if(isblank(countrows(filter(EmployeeList,EmployeeList[EmployeeID]=earlier(EmployeeList[EmployeeID])&&EmployeeList[WeekWorked]=earlier(EmployeeList[Next Week])))),EmployeeList[EmployeeID],blank())

then you would need to use your 'Next week' column as the date grouping and count the distinct rows for the new column.
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