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▷ ▶ Levels of Measurement SelectSmart.com free Education flowcharts and decision trees.
 A SelectSmart.com Flowchart by sparkyfan. See sparkyfan's 4me blog page. Viewed 730 times. Created September 2013. This SelectSmart.com Education flowchart, a free online decision tool is a creation of sparkyfan and for amusement purposes only. The implicit and explicit opinions expressed here are the author's. SelectSmart.com does not necessarily agree.
Levels of Measurement
By sparkyfan
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 Can the values your variable take on be put into a meaningful order? YES NO Do you know the precise spacing/distance between each value your variable can take on? Your variable is NOMINAL. Example: Political party with answer options (1) Democrat, (2) Republican, (3) Independent, (4) Other YES NO Your variable is INTERVAL/RATIO. Example: Age when reported in years. Your variable is ORDINAL. Does your variable have 7 or more categories? YES NO 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). 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