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Comparing Pre- and Post-Event in Power BI

Marco Russo and Alberto Ferrari do a bit of comparative analysis:

Many article ideas come from questions we receive from our customers and readers, and this article is no exception. The requirement is to analyze the sales volume before and after a selected time period, to a specific customer segment. In this case we define the segment as the brand that the customers have purchased in the past. For example, considering the customers who purchased Contoso-branded products in February 2018, what is the Sales Amount of Contoso and other products sold to those same customers 180 days before and after February 2018?

Read on to find out.