docs: function partial( lambda ) {
  
  	/**
  	* FUNCTION: cdf( x )
  	*	Evaluates the cumulative distribution function (CDF) for a Poisson distribution.
  	*
  	* @private
  	* @param {Number} x - input value
  	* @returns {Number} evaluated CDF
  	*/
  	return function cdf( x ) {
  		if ( x < 0 ) {
  			return 0;
  		}
  		return gammainc( lambda, floor( x ) + 1, {
  			'tail': 'upper',
  			'regularized': true
  		});
  	};
  }