![]() ![]() In statistics, or mathematics in general a capital letter sigma stands for "sum". ![]() Xn i=1 f(i) = Xn i=1 (expression involving i) (1) i= 1Indicates that the index variable is iand starts at 1. A series can be represented in a compact form, called summation or sigma notation. This is the estimate of sigma based on the range control chart. 4: Sigma Notation and Calculating the Arithmetic Mean. What does the Greek word sigma mean? The Greek letter sigma was derived from the Phoenician letter šīn, meaning tooth. The symbol Σ, used to indicate summation of a set or series. So the notation can be helpful in writing long sums in much a much shorter and clearer way.
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