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### Levels of Measurement #### Interval Scale - A numerical scale where the order of variables is known and the difference between them is measurable. - Includes all the properties of ordinal scale, but also offers a calculation of the difference between variables. - Example: 80 degrees is always...

### Levels of Measurement #### Interval Scale - A numerical scale where the order of variables is known and the difference between them is measurable. - Includes all the properties of ordinal scale, but also offers a calculation of the difference between variables. - Example: 80 degrees is always higher than 50 degrees and the difference between these two temperatures is the same as the difference between 70 degrees and 40 degrees. - No true zero value. #### Ratio Scale - A variable measurement scale that not only produces the order of variables but also makes the difference between variables known along with information on the value of true zero. - Has all the properties of the interval scale, but also has a true zero value. - Example: height, weight, or age ### Summary of Levels of Measurement | Offers: | Nominal | Ordinal | Interval | Ratio | |---|---|---|---|---| | The sequence of variables is established | - | Yes | Yes | Yes | | Mode | Yes | Yes | Yes | Yes | | Median | - | Yes | Yes | Yes | | Mean | - | - | Yes | Yes |