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Regression Discontinuity Method and Its Application

By summarizing the Regression Discontinuity (RD) analysis methods, this paper extends the fuzzy RD design into treatment analysis and intention to treat (ITT) analysis, and solves the incomplete explanation of causality that may be caused by missing observed values of explanatory variables under certain conditions. Then, combined with the influential WIC (the Women, Infants, and Children) program in North America, the paper empirically analyzes the impact of income shock on family structure, and introduces the application of RD in economic and social researches, including its prerequisites, application assumptions and empirical steps. At the same time, the paper proposes the extension of application.