Читать книгу Statistics and Probability with Applications for Engineers and Scientists Using MINITAB, R and JMP - Bhisham C. Gupta, Irwin Guttman - Страница 66

Numerical measures computed by using sample data are referred to as statistics.

In the field of statistics, it is standard practice to denote parameters by letters of the Greek alphabet and statistics by letters of the Roman alphabet.

We divide numerical measures into three categories: (i) measures of centrality, (ii) measures of dispersion, and (iii) measures of relative position. Measures of centrality give us information about the center of the data, measures of dispersion give information about the variation around the center of the data, and measures of relative position tell us what percentage of the data falls below or above a given measure.