negative variable in CAGR

Hey all,

I was trying to compute a CAGR, but the beginning variable is negative, so it throws the number off. What should I do? Sorry if it seems too easy, but thinking this would be the fastest way to get an answer. Thanks.

 

so are you saying its impossible to compute a CAGR if the beginning value must be negative. Lets throw in some variables say beginning is -5000 and ending is 200 over the course of 3 years...how would I compute it, assuming I must use those numbers?

 
Best Response

A CAGR for annualized growth from a negative to a positive number can be calculated if the number of time periods is odd but doesn't make sense.

Take your example:

The growth rate would have to solve the equation

-5000*(1+g)^3=200

This can be solved to yield g=-1.344, implying annual growth of -134.4% - however, this doesn't make sense:

After a year, you would have "grown" from -5000 to 1720, then back to -585 and back to 200, but this is not what you would expect from a CAGR.

Note also that the calculation no longer works if the number of years is even, so you'd be best of following LdnMezz's suggestion and just shifting until you get a proper result.

So, my five math geek minutes of the day are over, back to work on those comps... :)

 
ds445:
A CAGR for annualized growth from a negative to a positive number can be calculated if the number of time periods is odd but doesn't make sense.

Take your example:

The growth rate would have to solve the equation

-5000*(1+g)^3=200

This can be solved to yield g=-1.344, implying annual growth of -134.4% - however, this doesn't make sense:

After a year, you would have "grown" from -5000 to 1720, then back to -585 and back to 200, but this is not what you would expect from a CAGR.

Note also that the calculation no longer works if the number of years is even, so you'd be best of following LdnMezz's suggestion and just shifting until you get a proper result.

So, my five math geek minutes of the day are over, back to work on those comps... :)

true, it does work mathematically with that formula, but does an increase from -5000 to 200 really make sense as a negative 134.4% growth??

 

yeah, my point was that although you can calculate it mathematically, it doesn't really make sense, so you're best of either not showing it at all or finding a work-around so you get to use all positive numbers - just check with your associate what he wants to see

 

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