![]() Temperature, expressed in F or C, is not a ratio variable. Variables like height, weight, enzyme activity are ratio variables. When the variable equals 0.0, there is none of that variable. ![]() The difference between a temperature of 100 degrees and 90 degrees is the same difference as between 90 degrees and 80 degrees.Ī ratio variable, has all the properties of an interval variable, but also has a clear definition of 0.0. ![]() Another example would be movie ratings, from * to *****.Īn interval variable is a one where the difference between two values is meaningful. But the difference between the 7 and the 5 may not be the same as that between 5 and 3. A score of 7 means more pain than a score of 5, and that is more than a score of 3. For example, you might ask patients to express the amount of pain they are feeling on a scale of 1 to 10. You can code the five genotypes with numbers if you want, but the order is arbitrary and any calculations (for example, computing an average) would be meaningless.Īn ordinal variable, is one where the order matters but not the difference between values. For example, your study might compare five different genotypes. ![]() DefinitionsĪ categorical variable, also called a nominal variable, is for mutually exclusive, but not ordered, categories. Many statistics books begin by defining the different kinds of variables you might want to analyze. ![]()
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