How to Use the Weeks in Power BI.

When working with the Time Table hierarchy in Power BI (Year → Quarter → Month → Week → Date), the Week of Year field helps group data by calendar weeks. Here are key points to keep in mind:

Week Start & End: Weeks begin on Sunday and end on Saturday. Variable Week Lengths:

• Not all weeks contain 7 days. For example, the first or last week of the year may include fewer days depending on how the calendar aligns.
• Comparing Weeks: Be cautious when comparing data across weeks. Since week lengths can vary, totals or averages might not be directly comparable without normalization.
• Hierarchy Use: When drilling down from Year to Week, ensure your visualizations account for these variations to avoid misleading insights.

⚠️ Tip: For consistent week-to-week comparisons, consider using measures that adjust for the number of days in each week or use rolling averages.