To get 0 absolute pressure… Nominal scale is a naming scale, where variables are simply "named" or labeled, with no specific order. What are the nominal, ordinal, interval, ratio scales really? Objectives: To clarify whether a shorter interval between three successive home blood pressure (HBP) readings (10 s vs. 1 min) taken twice a day gives a better prediction of the average 24-h BP and better patient compliance. On the other hand, temperature (with the exception of Kelvin) is not a ratio scale, because zero exists (i.e. Types of variables. As to your zero blood pressure reading, that means that the body is providing 0 additional pressure over atmospheric pressure. zero on the Celsius scale is just the freezing point; it doesn’t mean that water ceases to exist). I'd sure call that the absence of blood pressure. Variables can be classified as nominal, ordinal, interval, or ratio variables. Design: We enrolled 56 patients from a hypertension clinic (mean age: 60 +/- 14 years; 54% female patients). Nominal (categorical) variables are simply names of categories. Ratio: exactly the same as the interval scale except that the zero on the scale means: does not exist.For example, a weight of zero doesn’t exist; an age of zero doesn’t exist. Like the tire, just matching atmospheric pressure doesn't do you any good. Nominal, ordinal, interval, and ratio scales can be defined as the 4 measurement scales used to capture and analyze data from surveys, questionnaires, and similar research instruments.All of the scales use multiple-choice questions. Ordinal scale has all its variables in a specific order, beyond just naming them. The Four levels of measurement scales for measuring variables with their definitions, examples and questions: Nominal, Ordinal, Interval, Ratio. 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