Ratio: In a ratio scale, numbers can be compared as multiples of one another. Thus one person can be twice as tall as another person. Important also, the number zero has meaning.
Thus the difference between a person of 35 and a person 38 is the same as the difference between people who are 12 and 15. A person can also have an age of zero.
Ratio data can be multiplied and divided because not only is the difference between 1 and 2 the same as between 3 and 4, but also that 4 is twice as much as 2.
Interval and ratio data measure quantities and hence are quantitative. Because they can be measured on a scale, they are also called scale data.
Example
A person's weight
The number of pizzas I can eat before fainting
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