What is the meaning of Samona? How popular is the baby name Samona? Learn the origin and popularity plus how to pronounce Samona
Variance. Variance (Ï 2) is a measure of the dispersion of a set of data points around their mean value. In other words, variance is a mathematical expectation of the average squared deviations from the mean. It is computed by finding the probability-weighted average of squared deviations from the expected value. Variance measures the variability from an average (volatility).
Divide by n - 1, where n is the number of data points. A long time ago, statisticians just divided by n when calculating the variance of the sample. This gives you the average value of the squared deviation, which is a perfect match for the variance of that sample.