sigma experimental gismu

x₁ is the standard variation of/in data set/distribution x₂; x₁ is the quantified (in)accuracy of the results x₂ given by some observation or measurement (procedure), calculated from/by standard x₃

Technically, there really is only one possible standard deviation, but in practice, it is often approximate via some means x3 (such as assuming that the distribution is Gaussian, even if it actually is only a finite data sample x2).

jbovlaste

In definition:

si'i: trinary mathematical operator: [sigma summation of a using variable b over range c].
snisimsumji: x₁ is the sigma summation of expression x₂ with variable x₃ over domain x₄.

In notes:

soi'auroi (comp!): almost never/nowhere (default: time sense)
cnanydelta: x₁ (li) is the (signed) difference between the average of all elements/data of x₂ (completely specified ordered multiset/list) and single number x₃ (li; default: infimum of x₂ under ordering x₆ if such is finite), using averaging function x₄ (default: arithmetic average), weights x₅ (completely specified ordered multiset/list with the same cardinality/length as x₂; default: according to notes), and inherited ordering x₆ (default: standard ordering on the set of reals).
sezborsigmyfrica: x₁ (data-set, sequence, list) is heteroskedastic by standard x₂.
sezborsigmysmi: x₁ (data-set, sequence, list) is homoskedastic by standard x₂.
gau'a (exp!): mekso (no-more-than-4-ary) operator: Gaussian function f(x, a, b, c) = c e^-((x-a).
se'au (exp!): mathematical quinary operator; big operator: left sequence notation/converter - operator a, sequence b defined as a function on index/argument/variable/parameter c, in set d, under ordering e