Chapter 20 Glossary

Measurement: A numerical variable

Observation: An observation is the factor name given to a value (measurement), at a particular period, of a particular variable.

Variable: A variable is a characteristic of a unit being observed that may assume more than one of a set of values to which a numerical measure or a category from a classification can be assigned (e.g. income, age, weight, etc., and “occupation”, “industry”, “disease”, etc

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