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 = 1,100, v2 = 483.6.
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: - 53.
- Choose a random positive number for the end value: 98.
Formula and calculation:
(v1 - v2) / v1 =
(- 53 - 98) / - 53 =
-151 / - 53 ≈
2.849056603774 ≈
2.85
Although the absolute difference is negative: -151, the relative decrease change is positive: 2.85. 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:
(1,100 - 483.6)/|1,100| =
616.4/1,100 =
616.4 ÷ 1,100 =
616.4 ÷ 1,100 × 100/100 =
(616.4 × 100 ÷ 1,100)/100 =
(61,640 ÷ 1,100)/100 ≈
56.036363636364/100 =
56.036363636364% ≈
56.04%
(Rounded off to max. 2 decimal places)
The relative percent decrease change
from the original, initial value 1,100 to the final, end value 483.6:
Rounded off to max. 12 decimal places ≈ 56.036363636364%
Rounded off to max. 2 decimal places ≈ 56.04%
The absolute (actual) difference
1,100 - 483.6 = 616.4
By what percentage has 1,100 decreased?
Answer: By ≈ 56.04%
By what percentage is 483.6 smaller than 1,100?
Answer: By ≈ 56.04%
The relative percent decrease change is positive,
so we really have a relative percent decrease
(the value goes down).