I am looking to do summary statistics on a column of varying lengths.

I want to do something like `=sum(A:A)`

except I want to avoid the first 5 rows of column A. Is there a way to do it?

EDIT: Someone pointed out a possible duplicate. Except neither of the solutions in that question actually works. If someone is proposing to apply `ISBLANK()`

to the whole column until the maximum index, I would like to see clarification on the different between that and formats such as `A:A`

-- in terms of speed.