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 = 113,451, v2 = 11.1.
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: - 91.
- Choose a random positive number for the end value: 64.
Formula and calculation:
(v1 - v2) / v1 =
(- 91 - 64) / - 91 =
-155 / - 91 ≈
1.703296703297 ≈
1.7
Although the absolute difference is negative: -155, the relative decrease change is positive: 1.7. 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:
(113,451 - 11.1)/|113,451| =
113,439.9/113,451 =
113,439.9 ÷ 113,451 =
113,439.9 ÷ 113,451 × 100/100 =
(113,439.9 × 100 ÷ 113,451)/100 =
(11,343,990 ÷ 113,451)/100 ≈
99.990216040405/100 =
99.990216040405% ≈
99.99%
(Rounded off to max. 2 decimal places)
The relative percent decrease change
from the original, initial value 113,451 to the final, end value 11.1:
Rounded off to max. 12 decimal places ≈ 99.990216040405%
Rounded off to max. 2 decimal places ≈ 99.99%
The absolute (actual) difference
113,451 - 11.1 = 113,439.9
By what percentage has 113,451 decreased?
Answer: By ≈ 99.99%
By what percentage is 11.1 smaller than 113,451?
Answer: By ≈ 99.99%
The relative percent decrease change is positive,
so we really have a relative percent decrease
(the value goes down).