code: private static boolean isCategorical(LinkedHashMap<String, Double> values) {
  		try {
  			for (String value : values.keySet()) {
  				Double.parseDouble(value);
  			}
  			return false;
  		} catch (Exception e) {
  			return true;
  		}
  
  	}
docs: If any not numeric value then categorical
  @param values
  @return