If you work with any statistical analysis tool, sometimes you may have run into configuring the data into either of these following categories: Nominal, Ordinal, Interval, Ratio
Here is what each term means:
|Nominal||Simply names or call them set of characters||Example: Full name, fruits, cars, etc|
|Ordinal||Nominal + They have order||Example: Small, medium, big|
|Interval||Ordinal + the intervals between each value are equally split||Example: temperature in Fahrenheit scale:10 20 30 etc|
Note that 20F is not twice as cold as 40F. So multiplication does not make sense on Interval data. But addition and subtraction works. Which brings us to next point: Ratio
|Ratio||Interval + multiplication makes sense||Weight: 60KG, 120KG.120 KG = 2 * 60 KG|
I hope the examples are of help when you are working with statistical analysis tools and need to categorize the data.