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 = - 0.07, v2 = - 3.3.
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: - 14.
- Choose a random positive number for the end value: 63.
Formula and calculation:
(v1 - v2) / v1 =
(- 14 - 63) / - 14 =
-77 / - 14 =
5.5
Although the absolute difference is negative: -77, the relative decrease change is positive: 5.5. 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:
(- 0.07 - (- 3.3))/|- 0.07| =
(- 0.07 + 3.3)/|- 0.07| =
3.23/0.07 =
3.23 ÷ 0.07 =
3.23 ÷ 0.07 × 100/100 =
(3.23 × 100 ÷ 0.07)/100 =
(323 ÷ 0.07)/100 ≈
4,614.285714285714/100 =
4,614.285714285714% ≈
4,614.29%
(Rounded off to max. 2 decimal places)
The relative percent decrease change
from the original, initial value - 0.07 to the final, end value - 3.3:
Rounded off to max. 12 decimal places ≈ 4,614.285714285714%
Rounded off to max. 2 decimal places ≈ 4,614.29%
The absolute (actual) difference
- 0.07 - (- 3.3) = - 0.07 + 3.3 = 3.23
By what percentage has - 0.07 decreased?
Answer: By ≈ 4,614.29%
By what percentage is - 3.3 smaller than - 0.07?
Answer: By ≈ 4,614.29%
The relative percent decrease change is positive,
so we really have a relative percent decrease
(the value goes down).