DAX Function for Year-Over-Year (YoY) Lost Clients Calculation

This DAX function calculates the number of lost clients for a company by comparing the number of customers who made a purchase in the previous year but didn't in the current year. The function is implemented using the CALCULATE and FILTER functions in DAX. The usage example demonstrates how to calculate the YoY lost clients for a specific year. It is important to note the required fields in the 'Sales' and 'Customers' tables for this function to work properly. For a more flexible context, modifications may be needed. The suggestion to explore advanced DAX functions and other BI-related topics on the Enterprise DNA Platform is also given to enhance proficiency in data analysis.