How to change compound annual growth rate CAGR formula depending on data existing not existing

Question

For 28 countries over a four-year period, I wish to determine the compound annual growth rate (CAGR).
I don't have all the information. The calculation will fail if there are any data gaps, so I must modify the formula to account for the number of years for which I have the data.

How can the calculation be changed automatically if a cell contains no data or if I discover missing data?

Answer 1

Sep to calculate CAGR. Excel has an RRI function.

So the formula will be:

=RRI(No. of Years, Starting Amount, Ending Amount), This returns CAGR % over the years. very simple and beautiful. All other formulas are NOT intuitive for normal users.