在Excel中使用另一个变量更改公式范围

Question

I'm trying to adjust how much of a data my formula looks at depending on another variable.

An example would be having 20 years worth of returns =IRR(A2:A22)

I'd like to add a variable that you change depending on how many years you would want to look at. Lets say we only wanted to look at the first 10 years how would I get my formula to automatically find the data for =IRR(A2:A12) ?

Answer 1

Let's assume that the year "variable" is in cell A1. It could be any cell, but for this example, A1:

=IRR($A$2:INDEX($A:$A,$A$1+2))

Notice that $A$1 is in the formula. You change that to your year variable.