In this video, we revisit the four main types of data: categorical (nominal and ordinal) and numerical (interval and ratio).
Nominal data – categories without order (e.g. gender, hair colour, regions)
Ordinal data – ordered categories without exact differences (e.g. satisfaction or happiness levels)
Interval data – numerical scales with equal intervals but no true zero (e.g. temperature, IQ)
Ratio data – numerical scales with equal intervals and a true zero (e.g. height, weight, income, age)
Understanding these distinctions is essential for accurate data analysis and interpretation.
