code: function transform() {
  		var kde = new KDE();
  		/**
  		* FUNCTION: transform( data )
  		*	Defines the data transformation.
  		*
  		* @private
  		* @param {number} data - numeric stream data
  		* @returns {number} transformed data
  		*/
  		return function transform( data ) {
  			kde.estimator( data, 'silverman' );
  			return kde.eval( data );
  		};
  	}
docs: end FUNCTION parse() 
  FUNCTION: transform()
  Returns a data transformation function.
  
  @private
  @returns {function} data transformation function