1. Eliminating interference factors: In the research process, there are some factors unrelated to the research object, such as market environment and policy factors, which will interfere with the research results. By controlling individuals, these interference factors can be eliminated and the research results can be more accurate.

2. Analysis of key factors: In the empirical study of funds, the research objects include many individuals, such as fund managers and fund companies. By controlling individuals, we can better analyze the influence of key factors on the research results, such as the investment strategy of fund managers and the management level of fund companies.

3. Improve the credibility of research: Controlling individuals helps to improve the credibility of research results. In the process of research, controlling individuals can help researchers eliminate the influence of other factors on the research results and make the research results more reliable.