Stevens' Levels of Measurement

Stevens' Levels of Measurement categorize data based on how they are measured and the kind of information they provide. There are four levels: Nominal (categories without order, like colors), Ordinal (categories with a specific order, like rankings), Interval (numbers with meaningful differences but no true zero, like temperature in Celsius), and Ratio (numbers with meaningful zero and equal intervals, like weight or height). Understanding these levels helps determine which statistical methods are appropriate for analyzing data accurately and effectively.