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).
Variance and standard deviation are very closely related. In order to calculate standard deviation, you first need to find variance. Variance is the average squared distance between each data point and the mean. It is given in squared units (e.g. mm 2). Standard deviation is the square root of the variance. It's units are given as basic units of measurement (e.g. mm). Standard deviation represents the âtypicalâ (though not âaverageâ) distance between the mean and the data points in the sample. It can be thought of as measuring the spread of data.