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 = 0.0063, v2 = - 32.
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: - 11.
- Choose a random positive number for the end value: 16.
Formula and calculation:
(v1 - v2) / v1 =
(- 11 - 16) / - 11 =
-27 / - 11 ≈
2.454545454545 ≈
2.45
Although the absolute difference is negative: -27, the relative decrease change is positive: 2.45. 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:
(0.0063 - (- 32))/|0.0063| =
(0.0063 + 32)/|0.0063| =
32.0063/0.0063 =
32.0063 ÷ 0.0063 =
32.0063 ÷ 0.0063 × 100/100 =
(32.0063 × 100 ÷ 0.0063)/100 =
(3,200.63 ÷ 0.0063)/100 ≈
508,036.507936507937/100 =
508,036.507936507937% ≈
508,036.51%
(Rounded off to max. 2 decimal places)
The relative percent decrease change
from the original, initial value 0.0063 to the final, end value - 32:
Rounded off to max. 12 decimal places ≈ 508,036.507936507937%
Rounded off to max. 2 decimal places ≈ 508,036.51%
The absolute (actual) difference
0.0063 + 32 = 32.0063 ≈ 32.01
By what percentage has 0.0063 decreased?
Answer: By ≈ 508,036.51%
By what percentage is - 32 smaller than 0.0063?
Answer: By ≈ 508,036.51%
The relative percent decrease change is positive,
so we really have a relative percent decrease
(the value goes down).