Excel's Subtotal command allows you to quickly create subtotals in your sorted data, and then collapse the view to to show only the new subtotal rows. When you try to copy the subtotals by themselves, ...

Learn how GROUPBY passes both subset and full arrays into LAMBDA in Excel, letting you compute percent shares fast and explain results clearly.

For many years, I used the SUBTOTAL function in Microsoft Excel to create easily visible subtotals at the top of my worksheets. However, when I encountered AGGREGATE, this became my go-to function for ...