code: public static Double probability(String value) {
  		Double doubleValue = notNegativeDouble(value);
  		Validate.inclusiveBetween(0.0, 1.0, doubleValue);
  		return doubleValue;
  	}
docs: Checks if the given String value is a probability (double value between 0.0 and 1.0, inclusive).
  @param value The String value to validate.
  @return The parsed double value.
  @throws ParameterException if the given String value cannot be parsed to a double or lies outside the bounds.