c3-broken-line {ctfepi}sealed case file
Broken Line
Case C3, The Salt TaxQuasi-Experimental Methodsscene 2medium200 pts
Case
The city taxed salty foods in 2028, and the mayor wants to know whether stroke admissions fell because of it.
What this scene will ask
Monthly rates around a policy change; segmented regression by OLS.
Planned flag: level change, 2 dp; slope change, 3 dp; counterfactual rate in the last month, 1 dp.
Status
[#] Sealed. This scene opens when it is written and passes review. Nothing on CTFEpi expires, so there is no rush.