code: function getQuantileFunction( mu, s2 ) {
  		var A = mu,
  			B = Math.sqrt( s2*2 );
  		/**
  		* FUNCTION: quantile( x )
  		*	Evaluates the quantile function at input value `x`.
  		*
  		* @private
  		* @param {Number} x - input value
  		* @returns {Number} evaluated quantile function
  		*/
  		return function quantile( x ) {
  			var C = 2*x - 1;
  			return A + B*erfinv( C );
  		};
  	}
docs: end FUNCTION getCDF() 
  FUNCTION: getQuantileFunction( mu, variance )
  Returns a quantile function for a normal distribution with mean `mu` and variance `s2`.
  
  @private
  @param {Number} mu - distribution mean
  @param {Number} variance - distribution variance
  @returns {Function} quantile function