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A comment on Survival of the Prettiest. Parent comment

Re:Survival of the Prettiest by pps43 on Tuesday September 19, 2017 @08:56PM (#15289964)
Standard deviation is lowercase sigma, sum is uppercase sigma. They are not the same.
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Re:Survival of the Prettiest by klipt on Tuesday September 19, 2017 @10:00PM (#15290188)
Uppercase sigma is used for multivariate distributions: https://en.wikipedia.org/wiki/Multivariate_normal_distributi...
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Re:Survival of the Prettiest by pps43 on Wednesday September 20, 2017 @10:18AM (#15293969)
But 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.

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