In statistics a common example is the difference between the mean of an entire population and the mean of a sample drawn from that population.
Error function math.
X erf x 1 erf x 0.
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Erf satisfies the identities.
Function in mathematics an expression rule or law that defines a relationship between one variable the independent variable and another variable the dependent variable.
Erf is implemented in the wolfram language as erf z a two argument form giving is also implemented as erf z0 z1.
Input specified as a symbolic number variable expression or function or as a vector or matrix of symbolic numbers variables expressions or functions.
In numerical analysis round off error.
Error in applied mathematics the difference between a true value and an estimate or approximation of that value.