Research Methodology
Variable
An attribute or characteristic that can take on different values across individuals, objects, or time.
What is Variable?
In research, a variable is any trait, characteristic, or phenomenon that can be measured or counted and can vary or change. It is the fundamental unit of analysis in empirical research.
Why Variable Matters
Variables operationalize theoretical constructs, allowing researchers to measure abstract concepts and analyze relationships between them empirically.
Example
A researcher studying physical health might use body mass index (BMI) as a variable to quantify weight relative to height across participants.
Common Mistakes
- Confusing the conceptual definition of a construct with the specific operational variable used to measure it.
- Treating constants (characteristics that do not vary in the sample) as variables.