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Standard deviation is lowercase sigma, sum is uppercase sigma. They are not the same.
by pps43 9y ago
Standard deviation is lowercase sigma, sum is uppercase sigma. They are not the same.
- klipt 9y agoUppercase sigma is used for multivariate distributions: https://en.wikipedia.org/wiki/Multivariate_normal_distribution#Notation_and_parametrization https://en.wikipedia.org/wiki/Multivariate_normal_distributi...
- pps43 9y agoBut this is not common. If you don't know what uppercase sigma refers to, sum is a much better guess than standard deviation of multivatiate normal distribution. In this case google is probably simply case insensitive.