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 = 191,141, v2 = 198,505.9.
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: - 72.
- Choose a random positive number for the end value: 99.
Formula and calculation:
(v1 - v2) / v1 =
(- 72 - 99) / - 72 =
-171 / - 72 =
2.375 ≈
2.38
Although the absolute difference is negative: -171, the relative decrease change is positive: 2.38. 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:
(191,141 - 198,505.9)/|191,141| =
- 7,364.9/191,141 =
- 7,364.9 ÷ 191,141 =
- 7,364.9 ÷ 191,141 × 100/100 =
(- 7,364.9 × 100 ÷ 191,141)/100 =
(- 736,490 ÷ 191,141)/100 =
- 3.853124133493/100 =
- 3.853124133493% ≈
- 3.85%
(Rounded off to max. 2 decimal places)
The relative percent decrease change
from the original, initial value 191,141 to the final, end value 198,505.9:
Not rounded = - 3.853124133493%
Rounded off to max. 2 decimal places ≈ - 3.85%
The absolute (actual) difference
191,141 - 198,505.9 = - 7,364.9
By what percentage has 191,141 decreased?
Answer: By ≈ - 3.85%
By what percentage is 198,505.9 smaller than 191,141?
Answer: By ≈ - 3.85%
The relative percent decrease change is negative,
so in this case we really have a relative percent increase instead
(the value goes up).