code: function quantile( vector, percent ) {
  		var numValues = vector.length,
  			id, value;
  
  		// Calculate the vector index marking the quantile:
  		id = ( numValues * percent ) - 1;
  
  		// Is the index an integer?
  		if ( id === parseInt( id, 10 ) ) {
  			// Value is the average between the value at id and id+1:
  			value = ( vector[ id ] + vector[ id+1 ] ) / 2.0;
  		} else {
  			// Round up to the next index:
  			id = Math.ceil( id );
  			value = vector[ id ];
  		}
  		return value;
  	}
docs: end FUNCTION quantiles() 
  FUNCTION: quantile( vector, percent )
  Finds a quantile value.
  
  @private
  @param {array} vector - 1d array
  @param {number} percent - quantile percent [0,1]
  @returns {number} quantile value