Ratio variables are a type of quantitative variable that have a true zero point, meaning that zero indicates the absence of the quantity being measured. This allows for meaningful comparisons between values, such as saying that one value is twice as much as another. Examples of ratio variables include height, weight, and temperature in Kelvin. In addition to having a true zero, ratio variables can be added, subtracted, multiplied, and divided. This makes them versatile for various statistical analyses. For instance, you can calculate the average income of a group or determine the speed of a vehicle in miles per hour using ratio variables.