Research Methodology - organisation of variables
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4 Terms
1
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Nominal
values represent distinct categories, no order. (gender, type of species)
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Ordinal
values have a meaningful order (one can be set higher than the other). (scores on Likert scale, Educational level)
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Interval
equal distance between values, no natural zero. (temperature in Celsius, years from a calendar)
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Ratio
values have order with equal distances between them and a natural 0 (0 means absence of variable). (income in euros, number of children)