Not all numbers are created equal. A zip code is not an income, and a star rating is not the same as a temperature.
Data comes in four flavors based on measurement scale: nominal (categories with no order), ordinal (categories with order), interval (numeric with no true zero), and ratio (numeric with true zero). Each scale unlocks different mathematical tools.
Drag each card to the correct scale
Shirt Sizes
S, M, L, XL
Customer ID
1001, 1002, 1003
Temperature (°C)
15, 20, 25 degrees
Body Weight (kg)
60, 75, 90 kilograms
Star Rating
1★, 2★, 5★
Eye Color
Blue, Brown, Green
Annual Income ($)
$30k, $50k, $80k
Exam Percentile
25th, 50th, 75th
Year of Birth
1995, 2000, 2005
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