Use the SUBTOTAL (and AGGREGATE) functions to avoid double counting

- [Instructor] When you work with lists…that have embedded subtotals in them,…you sometimes run into some calculation issues,…some double counting.…In this worksheet, you see a list of states,…here are the New England states.…We've got some totals in column C and D…and then a summary down here, for example.…There's a total and one over here…for two different years where…we've got the population estimates.…And this is true for the other states.…Now, some of you might be familiar with the term…and a feature called auto calculate in Excel.…If I highlight these numbers, I can look in the formula bar…down below and see the total, 14,727,584,…the same as this function, no big surprise there.…

If I click column D, we see the total…for all the entries here.…If you happen to have just a rough idea of what…US population is, it certainly isn't 642 million.…This is exactly twice for the 2015 estimate.…What we're doing here is adding up not only these,…but also these numbers, and we're doing this…for each of the groupings of states here.…