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 = 469.361, v2 = 146.1.
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: - 73.
- Choose a random positive number for the end value: 99.
Formula and calculation:
(v1 - v2) / v1 =
(- 73 - 99) / - 73 =
-172 / - 73 ≈
2.356164383562 ≈
2.36
Although the absolute difference is negative: -172, the relative decrease change is positive: 2.36. 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:
(469.361 - 146.1)/|469.361| =
323.261/469.361 =
323.261 ÷ 469.361 =
323.261 ÷ 469.361 × 100/100 =
(323.261 × 100 ÷ 469.361)/100 =
(32,326.1 ÷ 469.361)/100 =
68.87257356278/100 =
68.87257356278% ≈
68.87%
(Rounded off to max. 2 decimal places)
The relative percent decrease change
from the original, initial value 469.361 to the final, end value 146.1:
Not rounded = 68.87257356278%
Rounded off to max. 2 decimal places ≈ 68.87%
The absolute (actual) difference
469.361 - 146.1 = 323.261 ≈ 323.26
By what percentage has 469.361 decreased?
Answer: By ≈ 68.87%
By what percentage is 146.1 smaller than 469.361?
Answer: By ≈ 68.87%
The relative percent decrease change is positive,
so we really have a relative percent decrease
(the value goes down).