code: function KDE() {
  
  	this._kernel = pdf.normal( 0, 1 ); // standard normal
  	this._config = {
  		'domain': {
  			'min': 0,
  			'max': 1,
  			'pts': Math.pow( 2, 14 ) // 2^14
  		},
  		'bandwidth': [ 1.06 ] // Silverman's Rule of Thumb (n=1,sigma=1)
  	};
  
  	// ACCESSORS //
  	this._xValue = function ( d ) {
  		return d;
  	};
  
  	return this;
  }
docs: KDE // 
  FUNCTION: KDE()
  KDE constructor. Creates a new KDE instance.
  
  @constructor
  @returns {object} KDE instance