How to calculate the difference or variance between to items? Trying to figure out if one rank is within 10% of another.
How do I calculate the percentage difference between two percentages [University Statistics]?
[Statistics] How do you calculate variance and standard deviation using only probability?
Calculate Variance based on Cell Value
Is percentage difference equal to percentage change?
No, these are two different notions. In percentage difference, the point of reference is the average of the two numbers that are given to us, while in percentage change it is one of these numbers that is taken as the point of reference. Moreover, unlike percentage change, percentage difference is a comparison without direction.
How to find the percentage difference?
To calculate the percentage difference between two numbers, a and b, perform the following calculations:
- Find the absolute difference between two numbers:
|a - b|. - Find the average of those two numbers:
(a + b) / 2. - Divide the difference by the average:
|a - b| / ((a + b) / 2). - Express the result as percentages by multiplying it by
100. - Or use Omni's percentage difference calculator instead
When is the percentage difference equal to 100%?
The percentage difference is equal to 100% if and only if one of the numbers is three times the other number. It's not hard to prove that! Look:
-
The percentage difference between
aandbis equal to 100% if and only if we have|a - b| = (a + b) / 2. -
With no loss of generality, we assume
a ≥ b, so we can omit the absolute value at the left-hand side. It follows that2a - 2b = a + b -
Hence,
a = 3b, as claimed!