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Can the values your variable take on be put into a meaningful order?
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YES
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NO
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Do you know the precise spacing/distance between each value your variable can take on?
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Your variable is NOMINAL.
Example:
Political party with answer options (1) Democrat, (2) Republican, (3) Independent, (4) Other
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YES
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NO
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Your variable is INTERVAL/RATIO.
Example: Age when reported in years.
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Your variable is ORDINAL.
Does your variable have 7 or more categories?
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YES
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NO
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Although your variable is ORDINAL, you may choose to analyze it as if it is an interval/ratio variable. You can consider this variable to be: "Ordinal, treated as interval/ratio"
Example: Happiness measured on a 7-point scale (where 1 = very unhappy and 7 = happy).
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Treat this variable as a typical ordinal variable. Rather than being numerically meaningful, it is used as a grouping variable (treat it like a nominal variable).
Example: Happiness with answer options: (1) Not at all happy, (2) Neutral, (3) Very happy
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Levels of Measurement
More flowcharts
