Ever heard of the term “Ratio Scale” and wondered what it’s all about?

Well, you’re in for a treat. Let’s dive into this fascinating world of measurement and scales.

**What is Ratio Scale?**

A Ratio Scale is a measurement scale that not only provides a consistent difference between values but also **has a true zero point**, which means **the absence of the attribute being measured**.

**Example of Ratio Scale**

Consider weight. If something weighs 0 kilograms, it literally has **no weight**.

And the difference between 10kg and 20kg is the same as between 20kg and 30kg.

Other Examples:

**Age**: A person who is 20 years old is indeed twice as old as someone who is 10 years old.**Height**: A tree that is 10 meters tall is twice as tall as a tree that is 5 meters tall.**Income**: Earning $100,000 a year means you earn twice as much as someone earning $50,000.**Distance**: A 10-kilometer race is twice as long as a 5-kilometer race.

**Ratio Scale vs Interval Scale**

**Ratio Scale**: Has a true zero point, indicating the absence of the attribute. (e.g., Weight in kilograms)**Interval Scale**: Has meaningful differences between values, but zero doesn’t indicate the absence of the attribute. (e.g., Temperature in Celsius)

Think of it this way: In the interval scale, 0°C doesn’t mean there’s no warmth, it’s just freezing.

But in the ratio scale, 0kg means there’s absolutely no weight!

**Examples of Interval Scale**

**Temperature in Celsius or Fahrenheit**: While you can say 30°C is hotter than 20°C, you can’t say it’s “twice as hot”.**IQ Scores**: A person with an IQ of 140 doesn’t necessarily have “twice the intelligence” of someone with an IQ of 70.**SAT Scores**: The difference between scores of 1200 and 1100 is the same as between 1100 and 1000, but you can’t say a score of 1200 is “twice as good” as 600.**Credit Scores**: A score of 800 is better than 700, but not “twice as good”.**Likert Scale in Surveys**: For instance, rating satisfaction from 1-5. The difference between 4 (agree) and 5 (strongly agree) might not be the same as between 2 (disagree) and 3 (neutral).