[Power BI] DAX ALL Function Practical Series ② Ranking Part 5: Rank Change Analysis
If you mastered Cross Ranking—which weaves together the contexts of stores and products—in Part 4, it is now time to add the flow of time. "Why did a product that was 5th last month rise to 2nd this month?" The direction and speed of change are often more important than the static position of the data. In this Part 5, we will conquer the core DAX logic for calculating month-over-month rank fluctuations and implementing an arrow-based dashboard. 1. Analysis Data Overview: H1 2024 IT Device Sales The data we are analyzing consists of monthly sales records for 5 major product lines across 4 stores. 2. Why is Rank Change Analysis Important? Strategically, "who is climbing up" is far more important than simply "who is in 1st place." Early Trend Detection: Products with low total sales but rapidly rising ranks are targets where you should concentrate your marketing firepower. Crisis Signal Detection: If a product that was an immovable #1 starts slipping to 2n...