Use one real policy intervention as an example and demonstrate how you might apply interrupted time-series analysis as an assessment of that intervention. Specifically show how your design will deal with various threats to validity.

Campbell in his famous article, \”Reforms as experiments\”, argues that policies are difficult to evaluate because it is hard to account for external threats to validity in many quasi-experimental approaches to evaluation. He advocates the use of \”interrupted times-series analysis\” as one way to account for some of the major threats to validity. Use one real policy intervention as an example and demonstrate how you might apply interrupted time-series analysis as an assessment of that intervention. Specifically show how your design will deal with various threats to validity.
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