External module "stats/base/dists/invgamma/stdev/docs/types/index.d"

stdev

• stdev(alpha: number, beta: number): number

• Returns the standard deviation of an inverse gamma distribution.

  Notes

  • If alpha <= 0 or beta <= 0, the function returns NaN.

  Parameters

  • alpha: number

    shape parameter

  • beta: number

    rate parameter

  Returns number

  standard deviation

  Example

  var v = stdev( 3.0, 5.0 );
  // returns ~2.5

  Example

  var v = stdev( 4.0, 12.0 );
  // returns ~2.828

  Example

  var v = stdev( 8.0, 2.0 );
  // returns ~0.117

  Example

  var v = stdev( 3.0, -0.1 );
  // returns NaN

  Example

  var v = stdev( 1.5, 1.0 );
  // returns NaN

  Example

  var v = stdev( 3.0, NaN );
  // returns NaN

  Example

  var v = stdev( NaN, 2.0 );
  // returns NaN