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 = 2,084,411, v2 = 1,907,137.3.
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: - 67.
- Choose a random positive number for the end value: 11.
Formula and calculation:
(v1 - v2) / v1 =
(- 67 - 11) / - 67 =
-78 / - 67 ≈
1.164179104478 ≈
1.16
Although the absolute difference is negative: -78, the relative decrease change is positive: 1.16. 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:
(2,084,411 - 1,907,137.3)/|2,084,411| =
177,273.7/2,084,411 =
177,273.7 ÷ 2,084,411 =
177,273.7 ÷ 2,084,411 × 100/100 =
(177,273.7 × 100 ÷ 2,084,411)/100 =
(17,727,370 ÷ 2,084,411)/100 ≈
8.504738268988/100 =
8.504738268988% ≈
8.5%
(Rounded off to max. 2 decimal places)
The relative percent decrease change
from the original, initial value 2,084,411 to the final, end value 1,907,137.3:
Rounded off to max. 12 decimal places ≈ 8.504738268988%
Rounded off to max. 2 decimal places ≈ 8.5%
The absolute (actual) difference
2,084,411 - 1,907,137.3 = 177,273.7
By what percentage has 2,084,411 decreased?
Answer: By ≈ 8.5%
By what percentage is 1,907,137.3 smaller than 2,084,411?
Answer: By ≈ 8.5%
The relative percent decrease change is positive,
so we really have a relative percent decrease
(the value goes down).