Читать книгу Industrial Data Analytics for Diagnosis and Prognosis - Yong Chen - Страница 30
Sample Variance – Measure of Spread
ОглавлениеThe sample variance measures the spread of the data and is defined as
(2.1)
The square root of the sample variance, s = √s2, is called the sample standard deviation. The sample standard deviation is of the same measurement unit as the observations. For yi = axi, i = 1,2,…, n, its sample variance is
