Discontinuity Technique in Econometrics
The discontinuity technique is an econometric method for analyzing causal effects. It is employed in situations where a measurable variable or threshold naturally divides a population of interest into a treatment group, which is exposed to a certain intervention, and a control group, which is not.
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Discontinuity Technique in Econometrics
Geographic Boundary as a Discontinuity in the Mita Study
A study investigated the long-term economic impact of a historical forced labor system by comparing outcomes in villages just inside the system's geographic boundary with villages just outside of it. Why is this specific comparison of adjacent villages a methodologically sound approach for identifying the system's true effects?
Designing a Historical Impact Study
A study examines the long-term economic impact of a historical forced labor system by comparing outcomes in communities located just inside the system's geographic boundary with communities located just outside of it. The logic is that communities near the boundary are similar in most respects, except for their historical exposure to the system. Which of the following potential issues represents the most significant threat to the validity of this research design's conclusion?
Evaluating Alternative Research Designs
A historical study analyzed the long-term effects of a forced labor system by comparing communities on either side of the system's fixed geographic boundary. Match each element of this research design with its correct description in the context of the study.
In a study analyzing the long-term effects of a historical forced labor system defined by a geographic boundary, the most robust comparison for establishing a causal link would be between a randomly selected community deep within the boundary and a randomly selected community far outside of it.
Controlling for Confounding Variables
A researcher wants to use a historical geographic boundary to isolate the long-term causal effects of a specific policy that was applied to only one side. Arrange the following steps into the correct logical sequence for conducting this type of study.
Critique of a Proposed Research Design
A study uses a historical geographic boundary to analyze the long-term impact of an economic system that was applied only to communities on one side. The analysis reveals a sharp drop in household wealth for communities located just inside the boundary compared to those just outside. For this 'discontinuity' in wealth to be validly interpreted as the causal effect of the historical system, which of the following must be the most critical assumption?
Learn After
Discontinuity Design for a Merit Scholarship
Historians have proposed different frameworks to explain the historical wealth disparity between the West and other regions. Match each specific argument below to the explanatory framework it best represents.
A researcher wants to evaluate the impact of a new government program that provides extra funding to schools where the student poverty rate is above 40%. To do this, the researcher compares the academic outcomes of a school with a 75% poverty rate (which received funding) to a school with a 15% poverty rate (which did not). The researcher concludes the funding was ineffective because academic outcomes were not significantly different. What is the primary methodological flaw in this researcher's approach?
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A city implements a new policy to provide free public transit passes to all residents whose annual household income is below $30,000. A researcher evaluates the policy's impact on employment rates by comparing the employment outcomes of residents with incomes between $29,000 and $29,999 (who received the pass) to those with incomes between $30,000 and $30,999 (who did not). Which of the following scenarios represents the most significant threat to the validity of this study's design?
A city implements a new policy to provide free public transit passes to all residents whose annual household income is below $30,000. A researcher evaluates the policy's impact on employment rates by comparing the employment outcomes of residents with incomes between $29,000 and $29,999 (who received the pass) to those with incomes between $30,000 and $30,999 (who did not). Which of the following scenarios represents the most significant threat to the validity of this study's design?
A city wants to study the effect of a new small business grant on local employment. The grant is awarded to all businesses located on streets with a 'walkability score' of 75 or higher. To measure the grant's impact, researchers compare the change in employment for businesses on streets with scores between 75-77 (who received the grant) to businesses on streets with scores between 73-74 (who did not). For this study's conclusion about the grant's effect to be valid, which of the following must be the most critical assumption?
Evaluating a Free Tuition Policy
A research team wants to determine the causal effect of a specific intervention. In which of the following scenarios would a discontinuity analysis be the most appropriate and valid research method?