Answer:
longitudinal
Explanation:
Longitudinal research: This is one of the types of correlational research that works on a specific variable for a long period. The longitudinal research can last for around weeks, months, and years.
The researcher conducting the longitudinal research examines a particular population for quite a long time as per the requirement of the research. The longitudinal research study is purely qualitative.
Types of longitudinal study:
1. Cohort study.
2. Panel study.
A longitudinal study or research is also referred to as a diachronic study.