Ratio data, just like ordinal and interval data, can also be ranked and categorized. The intervals here are also equally spaced. The only thing that makes this one different from the rest is that ratio data has a true zero. For example, if you measure something in kgs, it is ratio data. Now, if something weighs zero, then it means that it does not weigh anything or most likely does not even exist. However, if the temperature in Fahrenheit or any other scale is zero, then that does not imply ‘no temperature.’