

{"id":57860,"date":"2018-06-01T06:46:54","date_gmt":"2018-06-01T13:46:54","guid":{"rendered":"https:\/\/www.questionpro.com\/blog\/?p=57860"},"modified":"2024-11-29T03:51:42","modified_gmt":"2024-11-29T10:51:42","slug":"interval-scale","status":"publish","type":"post","link":"https:\/\/www.questionpro.com\/blog\/interval-scale\/","title":{"rendered":"Interval Scale: Definition, Characteristics &amp; Examples"},"content":{"rendered":"\n<p>As you create a plan for analyzing quantitative data from your surveys, chances are you\u2019ve come across the phrase \u201cinterval scale.\u201d But what is it, and how does it differ from commonly associated terms like \u201cnominal scale\u201d and \u201cordinal scale\u201d?<\/p>\n\n\n\n<p>We\u2019ll cover the definition, describe key characteristics, and provide interval scale examples that could be especially useful for your survey strategy.<\/p>\n\n\n\n\n\n<h2 class=\"wp-block-heading\">What is the Interval Scale?<\/h2>\n\n\n\n<p><span data-preserver-spaces=\"true\">The interval scale is a<\/span><a class=\"_e75a791d-denali-editor-page-rtfLink\" href=\"https:\/\/www.questionpro.com\/blog\/quantitative-data\/\" target=\"_blank\" rel=\"noopener noreferrer\"><span data-preserver-spaces=\"true\">&nbsp;quantitative<\/span><\/a><span data-preserver-spaces=\"true\">&nbsp;measurement scale where there is order, the difference between the two variables is meaningful and equal, and the presence of zero is arbitrary. It measures variables that exist along a common scale at equal intervals. The measures used to calculate the distance between the variables are highly reliable.<\/span><\/p>\n\n\n\n<p><span data-preserver-spaces=\"true\">The interval scale is the third<\/span><a class=\"_e75a791d-denali-editor-page-rtfLink\" href=\"https:\/\/www.questionpro.com\/blog\/nominal-ordinal-interval-ratio\/\" target=\"_blank\" rel=\"noopener noreferrer\"><span data-preserver-spaces=\"true\">\u00a0level of measurement<\/span><\/a><span data-preserver-spaces=\"true\"> after the <a href=\"https:\/\/www.questionpro.com\/blog\/nominal-scale\/\">nominal scale<\/a> and the <a href=\"https:\/\/www.questionpro.com\/blog\/ordinal-scale\/\">ordinal scale<\/a>. Understanding the first two levels will help you differentiate interval measurements. <\/span><\/p>\n\n\n\n<p><span data-preserver-spaces=\"true\">A <strong>nominal scale<\/strong> is used when variables do not have a natural order or ranking. You can include numbered or unnumbered variables, but common survey examples include <a href=\"https:\/\/www.questionpro.com\/blog\/gender-survey-questions\/\">gender questions<\/a>, location, political party, pets, and so on.<\/span><\/p>\n\n\n\n<p><span data-preserver-spaces=\"true\">In contrast, on an <strong>ordinal scale,<\/strong> the rank of variables matters, but the difference or distance between the variables doesn\u2019t. Think about price range filters for online shopping. You can select \u201cless than $25,\u201d \u201c$26 up to $50,\u201d and so forth, but the difference between them is not relevant. Likewise, the ranking of variables such as \u201cWould not recommend\u201d and \u201cWould highly recommend\u201d matters, but the difference between them does not unless that difference is represented by another variable.\u00a0\u00a0<\/span><\/p>\n\n\n\n<p>Here is a detailed comparison to help you easily understand the differences between the main measurement scales.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"2048\" height=\"1223\" src=\"https:\/\/www.questionpro.com\/blog\/wp-content\/uploads\/2024\/11\/the-four-level-of-measurement.jpg\" alt=\"the-four-level-of-measurement\" class=\"wp-image-994029\" srcset=\"https:\/\/www.questionpro.com\/blog\/wp-content\/uploads\/2024\/11\/the-four-level-of-measurement.jpg 2048w, https:\/\/www.questionpro.com\/blog\/wp-content\/uploads\/2024\/11\/the-four-level-of-measurement-300x179.jpg 300w, https:\/\/www.questionpro.com\/blog\/wp-content\/uploads\/2024\/11\/the-four-level-of-measurement-1024x611.jpg 1024w, https:\/\/www.questionpro.com\/blog\/wp-content\/uploads\/2024\/11\/the-four-level-of-measurement-768x459.jpg 768w, https:\/\/www.questionpro.com\/blog\/wp-content\/uploads\/2024\/11\/the-four-level-of-measurement-1536x917.jpg 1536w\" sizes=\"(max-width: 2048px) 100vw, 2048px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Characteristics of Interval Scale<\/h2>\n\n\n\n<p><span data-preserver-spaces=\"true\">Now that you\u2019re familiar with the first two scales of measurement, it\u2019s much easier to understand them. In a sense, it\u2019s the combination of the other scales. The trickiest part about the interval scale is probably the fact that there is no true zero. But when you think about it, some variables do not have a universally constant zero. <\/span><\/p>\n\n\n\n<p><span data-preserver-spaces=\"true\">Consider this interval scale example: temperature in degrees Fahrenheit.<\/span><\/p>\n\n\n\n<p><span data-preserver-spaces=\"true\">If you\u2019re analyzing temperatures in degrees Fahrenheit, say 20-40 degrees and 40-60 degrees, there is order, and the difference between variables is meaningful, but the presence of zero is arbitrary. How is zero arbitrary? Zero degrees on the Fahrenheit (and Celsius) scale is not a universal constant but instead assigned to represent the temperature at which brine made from equal parts of ice, water, and salt freezes.<\/span><\/p>\n\n\n\n<p><span data-preserver-spaces=\"true\">Let\u2019s not get too wrapped up in the particulars of temperature, though. Your surveys will likely focus on other variables. It is easy to remember the objective of this scale because \u201cinterval\u201d refers to the interval (or distance) between two variables. Another way to remember this scale is that the data between two variables can be added or subtracted but not multiplied or divided. This is unlike the<\/span><a class=\"_e75a791d-denali-editor-page-rtfLink\" href=\"https:\/\/www.questionpro.com\/blog\/ratio-scale\/\" target=\"_blank\" rel=\"noopener noreferrer\"><span data-preserver-spaces=\"true\">&nbsp;ratio scale<\/span><\/a><span data-preserver-spaces=\"true\">, where division is defined between two variables.<\/span><\/p>\n\n\n\n<p><span data-preserver-spaces=\"true\">Want an easy guide to the interval scale and its data? We\u2019ve listed key characteristics here:<\/span><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"992\" height=\"619\" src=\"https:\/\/www.questionpro.com\/blog\/wp-content\/uploads\/2021\/07\/53-Characteristic-Interval-Scale.jpg\" alt=\"Characteristics of the interval scale\" class=\"wp-image-120663\" title=\"Characteristics of the interval scale\"\/><\/figure><\/div>\n\n\n<ol>\n<li><span style=\"font-weight: 400;\">The interval scale is preferred to the <\/span><a href=\"https:\/\/www.questionpro.com\/blog\/nominal-scale\/\"><span style=\"font-weight: 400;\">nominal scale<\/span><\/a><span style=\"font-weight: 400;\"> or <a href=\"https:\/\/www.questionpro.com\/blog\/ordinal-scale\/\">ordinal scale<\/a> <\/span><span data-preserver-spaces=\"true\">because the latter two are qualitative scales. The interval scale is quantitative in the sense that it can quantify the difference between values.<\/span><\/li>\n\n\n\n<li><span data-preserver-spaces=\"true\">Interval data can be discrete with whole numbers like 8 degrees, 4 years, 2 months, etc., or continuous with fractional numbers like 12.2 degrees, 3.5 weeks or 4.2 miles.<\/span><\/li>\n\n\n\n<li><span data-preserver-spaces=\"true\">You can subtract values between two variables to help understand the difference between them.<\/span><\/li>\n\n\n\n<li><span data-preserver-spaces=\"true\">Interval measurement allows you to calculate the mean and median of variables.<\/span><\/li>\n\n\n\n<li><span data-preserver-spaces=\"true\">Interval data is especially useful in business, social, and scientific analysis and strategy because it is straightforward and quantitative.<\/span><\/li>\n\n\n\n<li><span data-preserver-spaces=\"true\">This is a preferred scale in statistics because you can assign a numerical value to any arbitrary <a href=\"https:\/\/www.questionpro.com\/blog\/360-leadership-assessment\/\">360 leadership assessment<\/a>, such as feelings and sentiments.<\/span><\/li>\n<\/ol>\n\n\n\n<p>Now that you know how to spot the interval scale when you see it, let\u2019s take a look at some useful interval scale examples.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Importance of Interval Scales in Data Measurement<\/h2>\n\n\n\n<p>Interval scales are important in data measurement for several reasons, making them a valuable tool in research and analysis. Here\u2019s a simple breakdown of their significance:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Equal Distances<\/h3>\n\n\n\n<p>Interval scales measure data with equal distances between points. This means that the difference between 10 and 20 is the same as the difference between 30 and 40. This consistency allows us to make meaningful comparisons.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Mathematical Operations<\/h3>\n\n\n\n<p>Because the intervals are consistent, we can perform a range of mathematical calculations. We can add, subtract, and compute averages.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. No True Zero<\/h3>\n\n\n\n<p>Interval scales do not have a true zero point. For instance, in Celsius, 0\u00b0C doesn\u2019t mean \u201cno temperature\u201d\u2014it\u2019s just a point on the scale. This is different from ratio scales (like weight), where zero means none. Even without a true zero, we can still talk about differences, like saying one temperature is warmer than another.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. Real-World Examples<\/h3>\n\n\n\n<p>You can find interval scales in everyday life. Common examples include temperature (Celsius and Fahrenheit) and calendar years. Understanding these scales helps us interpret data in areas like weather forecasting or historical trends.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5. Easy to Understand<\/h3>\n\n\n\n<p>The equal intervals make it easy for anyone to grasp the meaning behind the numbers. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">6. Supports Advanced Analysis<\/h3>\n\n\n\n<p>Many statistical methods rely on interval data. This means researchers can use tools like averages and correlations to analyze their data effectively.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Interval Scale Examples<\/h2>\n\n\n\n<p>Questions that can be measured on the interval scale are the most commonly used question types in research studies. To receive answers in the form of interval data, you need to limit feedback options to variables that can be assigned a numerical value where the difference between the two variables is equal.<\/p>\n\n\n\n<p>You have probably seen the following scales used in a research study: agreement, satisfaction levels, or likelihood. The survey needs to be scaled so variables can meet the criteria of interval measurement. Otherwise, the data you receive in feedback will be difficult to quantify.<\/p>\n\n\n\n<p>Consider these questions as you write your next survey. They are all compatible with the interval scale and offer actionable data:<\/p>\n\n\n\n<p><span style=\"font-family: Raleway, sans-serif; font-size: 20px;\">Likert Scale<\/span> <\/p>\n\n\n\n<p><span data-preserver-spaces=\"true\">One of the most commonly used interval scale questions is arranged on a five-point<\/span><a class=\"_e75a791d-denali-editor-page-rtfLink\" href=\"https:\/\/www.questionpro.com\/article\/likert-scale-survey-questions.html\" target=\"_blank\" rel=\"noopener noreferrer\"><span data-preserver-spaces=\"true\">&nbsp;Likert Scale<\/span><\/a><span data-preserver-spaces=\"true\">&nbsp;question, where each emotion is denoted with a number, and the variables range from extremely dissatisfied to extremely satisfied.<\/span><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"914\" height=\"285\" src=\"https:\/\/www.questionpro.com\/blog\/wp-content\/uploads\/2018\/06\/Likert-Scale-New.png\" alt=\"Likert Scale\" class=\"wp-image-57867\"\/><\/figure>\n\n\n\n<p><span style=\"font-family: Raleway, sans-serif; font-size: 20px;\">Net Promoter Score (NPS)<\/span> <\/p>\n\n\n\n<p><span data-preserver-spaces=\"true\">In a<\/span><a class=\"_e75a791d-denali-editor-page-rtfLink\" href=\"https:\/\/www.questionpro.com\/features\/net-promoter-score.html\" target=\"_blank\" rel=\"noopener noreferrer\"><span data-preserver-spaces=\"true\">&nbsp;Net Promoter Score (NPS)<\/span><\/a><span data-preserver-spaces=\"true\">&nbsp;question, the respondents reply on a scale of 1-10 rating how likely they are to refer a company\/product\/service to a peer.<\/span><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"780\" height=\"172\" src=\"https:\/\/www.questionpro.com\/blog\/wp-content\/uploads\/2018\/06\/NPS.jpg\" alt=\"Net Promoter Score (NPS)\" class=\"wp-image-57864\"\/><\/figure>\n\n\n\n<p><span style=\"font-family: Raleway, sans-serif; font-size: 20px;\">Bipolar Matrix Table<\/span> <\/p>\n\n\n\n<p><span data-preserver-spaces=\"true\">When you include this type of question, participants assess an object on a<\/span><a class=\"_e75a791d-denali-editor-page-rtfLink\" href=\"https:\/\/www.questionpro.com\/blog\/feature-update-bipolar-matrix-question-type\/\" target=\"_blank\" rel=\"noopener noreferrer\"><span data-preserver-spaces=\"true\">&nbsp;bipolar matrix table<\/span><\/a><span data-preserver-spaces=\"true\">&nbsp;using a five-point rating scale that helps you quantify sentiments by creating a ranking system.<\/span><\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>LEARN ABOUT:&nbsp;<\/strong><a href=\"https:\/\/www.questionpro.com\/blog\/bipolar-questionnaire\/\">Bipolar Questionnaire<\/a><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1182\" height=\"410\" src=\"https:\/\/www.questionpro.com\/blog\/wp-content\/uploads\/2018\/06\/bipolar-matrix-scale.png\" alt=\"Bipolar Matrix Scale\" class=\"wp-image-57862\"\/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">&nbsp;Conclusion<\/h2>\n\n\n\n<p><span data-preserver-spaces=\"true\">The interval scale gives <a href=\"https:\/\/www.questionpro.com\/blog\/surveys\/\">survey<\/a> strategists the ability to quantify and differentiate between options so their feedback can contribute to meaningful goals and results. It\u2019s often more effective for most businesses and scientific studies than the nominal scale or ordinal scale, as it can account for quantitative outcomes.&nbsp;<\/span><\/p>\n\n\n\n<p><span data-preserver-spaces=\"true\">QuestionPro makes it easy to write, share, and analyze surveys to gather deep insights. Use this article to select the best interval scale<\/span><a class=\"_e75a791d-denali-editor-page-rtfLink\" href=\"https:\/\/www.questionpro.com\/article\/survey-question-answer-type.html\" target=\"_blank\" rel=\"noopener noreferrer\"><span data-preserver-spaces=\"true\">&nbsp;question-answer types<\/span><\/a><span data-preserver-spaces=\"true\">&nbsp;for your next study.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>As you create a plan for analyzing quantitative data from your surveys, chances are you\u2019ve come across the phrase \u201cinterval [&hellip;]<\/p>\n","protected":false},"author":86,"featured_media":97944,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[203],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Interval Scale: Definition, Characteristics &amp; Examples<\/title>\n<meta name=\"description\" content=\"The interval scale is defined as the 3rd quantitative level of measurement where the difference between 2 variables is meaningful. 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