Statistics 101: Nominal, Ordinal, Interval, Ratio Data


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.

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