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 = 184, v2 = 776.6.
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: - 86.
- Choose a random positive number for the end value: 27.
Formula and calculation:
(v1 - v2) / v1 =
(- 86 - 27) / - 86 =
-113 / - 86 =
1.313953488372 ≈
1.31
Although the absolute difference is negative: -113, the relative decrease change is positive: 1.31. 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:
(184 - 776.6)/|184| =
- 592.6/184 =
- 592.6 ÷ 184 =
- 592.6 ÷ 184 × 100/100 =
(- 592.6 × 100 ÷ 184)/100 =
(- 59,260 ÷ 184)/100 ≈
- 322.065217391304/100 =
- 322.065217391304% ≈
- 322.07%
(Rounded off to max. 2 decimal places)
The relative percent decrease change
from the original, initial value 184 to the final, end value 776.6:
Rounded off to max. 12 decimal places ≈ - 322.065217391304%
Rounded off to max. 2 decimal places ≈ - 322.07%
The absolute (actual) difference
184 - 776.6 = - 592.6
By what percentage has 184 decreased?
Answer: By ≈ - 322.07%
By what percentage is 776.6 smaller than 184?
Answer: By ≈ - 322.07%
The relative percent decrease change is negative,
so in this case we really have a relative percent increase instead
(the value goes up).