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 = 32, v2 = 308.
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: - 17.
- Choose a random positive number for the end value: 55.
Formula and calculation:
(v1 - v2) / v1 =
(- 17 - 55) / - 17 =
-72 / - 17 =
4.235294117647 ≈
4.24
Although the absolute difference is negative: -72, the relative decrease change is positive: 4.24. 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:
(32 - 308)/|32| =
- 276/32 =
- 276 ÷ 32 =
- 276 ÷ 32 × 100/100 =
(- 276 × 100 ÷ 32)/100 =
(- 27,600 ÷ 32)/100 =
- 862.5/100 =
- 862.5%
The relative percent decrease change
from the original, initial value 32 to the final, end value 308:
= - 862.5%
The absolute (actual) difference
32 - 308 = - 276
By what percentage has 32 decreased?
Answer: By - 862.5%
By what percentage is 308 smaller than 32?
Answer: By - 862.5%
The relative percent decrease change is negative,
so in this case we really have a relative percent increase instead
(the value goes up).