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Quantitative and qualitative data are two types of data.
Qualitative data -- measurement expressed not in terms of numbers, but rather by means of a natural language description. In statistics it is often used interchangably with "categorical" data.
For example: favourite colour = "blue" height = "tall"
Quantitative data -- measurement expressed not by means of a natural language description, but rather in terms of numbers.
For example: favourite colour = "450 nm" height = "1.8 m"