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May 26th, 2010, 08:09 AM   #1
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Calculating positive percentage change

Hi there, I am trying to calculate the positive change between monthly values.

Lets say I have the following values:

Month 1) -25,300
Month 2) -18,900
Month 3) -8,200
Month 4) -1,300
Month 5) 1,100
Month 6) 4,200

I want to see what the change is every month as a positive percentage. For the positive numbers, I can calculate say for month 6, the difference was (month6-month5)/month5. Is there a formula to always give me a positive change regardless of whether the inputs are negative or positive?
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May 26th, 2010, 01:42 PM   #2
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Re: Calculating positive percentage change

I think if you have a number of months m1, m2, m3......m(n)....

to find the positive percent gain from some month m(n) to the next month m(n+1), I thnk the equation is

[m(n+1) - m(n)] / |m(n)|. Notice that the denominator is in absoulte value brackets. This way, it doesn't matter if any of the terms are negative...you will always get a positive result as long as money keeps going up every month.
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May 27th, 2010, 06:10 AM   #3
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Re: Calculating positive percentage change

Great that looks like it did the trick. http://www.purplemath.com/modules/absolute.htm
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January 30th, 2017, 08:27 AM   #4
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You can check it at www.percentagechangecalculator.com.
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February 9th, 2017, 07:14 AM   #5
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The "percentage change" is always the amount of change divided by the absolute value of the original amount. Here, on the first month, the amount was -25300. On month 2, the amount was -18900, an increase of -18900- (-25300)= 6400. so the percentage increase is 25.3%.
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