The variance is the statistical indicator which measures the distance of a time series around the mean of the latter.
Variance = Average of the squares of the deviations from this average
With V the variance, n the number of samples, x "i" the value of the sample and x "bars" the mean of the series
For a product that has sold:
100 produced in 2017
150 products in 2018
200 products in 2019
The average is 150 products sold
The mean of the squared deviations is ((100-150) ² + (150-150) ² + (200-150) ²) = 2500 + 0 + 2500 = 5000
The variance is translated in English by variance
Standard deviation is often used alongside variance. It is the square root of the variance. Here, it is worth 71. Thus the product is sold on average 150 times more or less 71.
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