The relative decrease change. Definition:
The relative decrease change is the difference in an indicator over two periods in time, v1 - v2, relative to the value of the indicator in the earlier period, v1.
- Where:
- v1 - is called the reference value (original, initial number);
- v2 - is called the new value (the end value).
- In our case: v1 = 51,539, v2 = 60,033.5.
The relative decrease change. Formula:
The relative decrease change =
The actual change / |v1|
(v1 - v2) / |v1| =
- Legend:
- v1 - the original number
- |v1| - the positive value of v1, |v1| >= 0. By example: |10| = 10; |-10| = 10.
- v2 - the new value
- The actual change = v1 - v2
- / - the fraction bar (division)
Why do we use |v1| in the formula instead of v1?
- Let's see what happens if we use v1 instead of |v1|:
- Choose a random negative number as the initial value: - 74.
- Choose a random positive number for the end value: 84.
Formula and calculation:
(v1 - v2) / v1 =
(- 74 - 84) / - 74 =
-158 / - 74 ≈
2.135135135135 ≈
2.14
Although the absolute difference is negative: -158, the relative decrease change is positive: 2.14. By using |v1| instead of v1, the error is corrected.
The relative percent decrease change. Detailed calculations below
By multiplying a number by the fraction 100/100,
we change only the form of the result, not the result.
- 100/100 = 100% = 100 ÷ 100 = 1.
- n × 100/100 = (n × 100)/100 = (n × 100)%, any number.
The relative percent decrease change. Formula:
The relative percent decrease change =
The relative decrease change × 100/100 =
(The relative decrease change × 100)/100 =
(The relative decrease change × 100)%
Calculate the relative percent decrease change:
(51,539 - 60,033.5)/|51,539| =
- 8,494.5/51,539 =
- 8,494.5 ÷ 51,539 =
- 8,494.5 ÷ 51,539 × 100/100 =
(- 8,494.5 × 100 ÷ 51,539)/100 =
(- 849,450 ÷ 51,539)/100 ≈
- 16.481693474844/100 =
- 16.481693474844% ≈
- 16.48%
(Rounded off to max. 2 decimal places)
The relative percent decrease change
from the original, initial value 51,539 to the final, end value 60,033.5:
Rounded off to max. 12 decimal places ≈ - 16.481693474844%
Rounded off to max. 2 decimal places ≈ - 16.48%
The absolute (actual) difference
51,539 - 60,033.5 = - 8,494.5
By what percentage has 51,539 decreased?
Answer: By ≈ - 16.48%
By what percentage is 60,033.5 smaller than 51,539?
Answer: By ≈ - 16.48%
The relative percent decrease change is negative,
so in this case we really have a relative percent increase instead
(the value goes up).