docs: function partial( alpha, beta ) {
  
  	/**
  	* FUNCTION: pdf( x )
  	*	Evaluates the probability density function (PDF) for a Pareto distribution.
  	*
  	* @private
  	* @param {Number} x - input value
  	* @returns {Number} evaluated PDF
  	*/
  	return function pdf( x ) {
  		var num, denom;
  		if ( x >= beta ) {
  			num = alpha * Math.pow( beta, alpha );
  			denom = Math.pow( x, alpha + 1 );
  			return num / denom;
  		} else {
  			return 0;
  		}
  	};
  }