One thing that is sometimes confusing is that the same variable can be collected at different levels of measurements.

Question

Quizplus · Accepted Answer

This is true. For example, a variable such as income can be collected at the individual level (e.g. individual salary), household level (e.g. household income), or even at the aggregate level (e.g. average income for a city or state). However, the interpretation and analysis of the variable may differ depending on the level of measurement.

One Thing That Is Sometimes Confusing Is That the Same