Observational data
Population of interest
A specific group that a researcher aims to study in order to draw meaningful conclusions or make statistical inferences about its characteristics.
Sample of a population
A subset of the population of interest. Used to represent the population in statistical analysis.
Variable of interest
A changing quantity which is being measured in an experimental study.
Census
The process of gathering information about the members of a given population of interest.
Cohort
A group of subjects who share a particular event during a particular time duration.