Measure abnormal stock performance around corporate events using event study methodology. Calculate AR, CAR, and BHAR with the market model.
Estimated from estimation window using OLS regression
Intercept (daily)
Market sensitivity
Enter as decimals (e.g. 0.02 = 2%) or percentages
💡 Quick Load Example Data
Load a pre-filled earnings announcement example to see how CAR works.
Expected Return
E[R_it] = α + β × R_mt
Market model: OLS-estimated α and β from estimation window.
Abnormal Return
AR_t = R_it − E[R_it]
Actual return minus the expected (normal) return for each day.
Cumulative AR
CAR = Σ AR_t
Sum of all abnormal returns across the event window.