Sigma is a letter in the Greek alphabet, and it is also the name of a powerful statistical tool. But who invented sigma? That is a question that has puzzled historians for years.
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What is Sigma?
Sigma is a statistical measure of dispersion, also known as a standard deviation. Sigma measures how much variation there is in a set of data.
For example, if we have a set of data that is all the same value, then the variance would be zero and the standard deviation would also be zero. However, if the data set is spread out, then the variance would be high and the standard deviation would also be high.
Who invented sigma?
The term was first used by Karl Pearson in 1893.
Use of Sigma
Sigma is a mathematical symbol that is used in a variety of different ways. Most commonly, it is used to represent a summation, which is the process of adding up a series of numbers. Sigma can also be used to represent an average, a standard deviation, or a correlation coefficient. In addition, sigma can be used as a symbol for the set of all real numbers, or as a symbol for infinity.
Also Read: Who Invented Infinity