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 = 1,083,594, v2 = 1,243,338.3.
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: - 56.
- Choose a random positive number for the end value: 12.
Formula and calculation:
(v1 - v2) / v1 =
(- 56 - 12) / - 56 =
-68 / - 56 ≈
1.214285714286 ≈
1.21
Although the absolute difference is negative: -68, the relative decrease change is positive: 1.21. 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:
(1,083,594 - 1,243,338.3)/|1,083,594| =
- 159,744.3/1,083,594 =
- 159,744.3 ÷ 1,083,594 =
- 159,744.3 ÷ 1,083,594 × 100/100 =
(- 159,744.3 × 100 ÷ 1,083,594)/100 =
(- 15,974,430 ÷ 1,083,594)/100 ≈
- 14.742080520933/100 =
- 14.742080520933% ≈
- 14.74%
(Rounded off to max. 2 decimal places)
The relative percent decrease change
from the original, initial value 1,083,594 to the final, end value 1,243,338.3:
Rounded off to max. 12 decimal places ≈ - 14.742080520933%
Rounded off to max. 2 decimal places ≈ - 14.74%
The absolute (actual) difference
1,083,594 - 1,243,338.3 = - 159,744.3
By what percentage has 1,083,594 decreased?
Answer: By ≈ - 14.74%
By what percentage is 1,243,338.3 smaller than 1,083,594?
Answer: By ≈ - 14.74%
The relative percent decrease change is negative,
so in this case we really have a relative percent increase instead
(the value goes up).