code: function partial( lambda ) {
  
  	/**
  	* FUNCTION: mgf( t )
  	*	Evaluates the moment-generating function (MGF) for an exponential distribution.
  	*
  	* @private
  	* @param {Number} t - input value
  	* @returns {Number} evaluated MGF
  	*/
  	return function mgf( t ) {
  		if ( t >= lambda ) {
  			return NaN;
  		}
  		return lambda / ( lambda - t );
  	};
  }
docs: PARTIAL // 
  FUNCTION: partial( lambda )
  Partially applies rate parameter `lambda` and returns a function for evaluating the moment-generating function (MGF) for an exponential distribution.
  
  @param {Number} lambda - rate parameter
  @returns {Function} MGF