function median( alpha, beta ) {
	if ( alpha <= 0.0 || beta <= 0.0 ) {
		return NaN;
	}
	return beta * pow( 2.0, 1.0/alpha );
}
Returns the median of a Pareto (Type I) distribution.

@param {PositiveNumber} alpha - shape parameter
@param {PositiveNumber} beta - scale parameter
@returns {PositiveNumber} median

@example
var v = median( 1.0, 1.0 );
// returns 2.0

@example
var v = median( 4.0, 12.0 );
// returns ~14.27

@example
var v = median( 8.0, 2.0 );
// returns ~2.181

@example
var v = median( 1.0, -0.1 );
// returns NaN

@example
var v = median( -0.1, 1.0 );
// returns NaN

@example
var v = median( 2.0, NaN );
// returns NaN

@example
var v = median( NaN, 2.0 );
// returns NaN