Probable Error

Author

Eric W. Weisstein
March 2, 2004

This notebook downloaded from http://mathworld.wolfram.com/notebooks/Statistics/ProbableError.nb.

For more information, see Eric's MathWorld entry http://mathworld.wolfram.com/ProbableError.html.

©2005 Wolfram Research, Inc. except for portions noted otherwise

Numeric Value

FindRoot[(1/2)Erf[(x/(Sqrt[2]))]==1/4,{x,0,.6}]

InverseErf[x]

Solve[(1/2)Erf[(x/(Sqrt[2]))]==1/4,x]

FunctionExpand[%]

N[PE=Sqrt[2]InverseErf[1/2],100]