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 = 378,903, v2 = 414,175.3.
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: - 66.
- Choose a random positive number for the end value: 62.
Formula and calculation:
(v1 - v2) / v1 =
(- 66 - 62) / - 66 =
-128 / - 66 ≈
1.939393939394 ≈
1.94
Although the absolute difference is negative: -128, the relative decrease change is positive: 1.94. 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:
(378,903 - 414,175.3)/|378,903| =
- 35,272.3/378,903 =
- 35,272.3 ÷ 378,903 =
- 35,272.3 ÷ 378,903 × 100/100 =
(- 35,272.3 × 100 ÷ 378,903)/100 =
(- 3,527,230 ÷ 378,903)/100 ≈
- 9.309057991095/100 =
- 9.309057991095% ≈
- 9.31%
(Rounded off to max. 2 decimal places)
The relative percent decrease change
from the original, initial value 378,903 to the final, end value 414,175.3:
Rounded off to max. 12 decimal places ≈ - 9.309057991095%
Rounded off to max. 2 decimal places ≈ - 9.31%
The absolute (actual) difference
378,903 - 414,175.3 = - 35,272.3
By what percentage has 378,903 decreased?
Answer: By ≈ - 9.31%
By what percentage is 414,175.3 smaller than 378,903?
Answer: By ≈ - 9.31%
The relative percent decrease change is negative,
so in this case we really have a relative percent increase instead
(the value goes up).