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An Interval scale is a quantitative measurement scale in the four “levels of measurement” as per S.S. Stevens’ classification. This scale is not only useful for ranking and ordering of attributes but also provides us with the degree of difference.
The interval scale measures its data along with the equal distance between two adjacent values. This is the reason behind its name “interval”. However, an interval scale cannot have zero as its value; zero has an arbitrary place in this scale but not a complete absence of variables.
For instance, for an IQ test, one may use an interval scale. The use of an interval scale can help measure that the difference between an IQ of 80 and 90 is the same as an IQ of 90 and 100. At the same time, the score cannot be zero, because the minimum level for IQ is 40.
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After understanding what an Interval scale is how it works let’s look for ways to use the scale.
The interval scale generally uses questionnaires to collect data. To receive feedback from your target audience the choice of the option must be properly generated. This will help assign a numerical value to the data which will make the difference between two variables equal and easy to measure.
For example, on an agree-disagree scale you can allot numbers as following:
In simple words, NPS® survey software is a tool used to create NPS® surveys- a type of customer satisfaction survey. NPS® or Net Promoter Score® is an important metric that organizations track to measure and improve customer satisfaction.
You may have come across interval scales, maybe online or in reality, where you were a part of the target audience. Now you can curate your own interval scale to collect data.