With mental disorders, diseases, or isolated incidences, populations can be as small as one. This dictates case studies as a way to gain research and knowledge. A case study is an in-depth study of a single research subject. Correlation Correlation is the relationship between variables. This can provide useful data under certain circumstances.
Correlation is useful in studies concerning heredity.
Correlation does NOT imply causation. There is a high correlation between eating ice cream and violent crimes. Correlation Correlation is the relationship between variables. Correlation does NOT imply causation. The more classes you skip, the lower your grade will be.