What is an impact window?

An empirical trading-day estimate of how quickly public insider-filing information historically diffused into cumulative abnormal return for a country and cohort.

Impact windows methodology

Q: What is the car80_t165 rule?

The reported horizon x is the first trading day where cumulative abnormal return reaches at least 80% of terminal CAR and the marginal abnormal-return t-statistic is below 1.65.

InsiderScope estimates an information window for each country and cohort using event-study curves in trading days. For every horizon τ, the platform reports sample size, mean cumulative abnormal return, standard error, t-statistic, hit rate, and Wilson confidence interval. The estimate is descriptive and historical, not a trading instruction.

The knee rule

The public product claim uses the car80_t165 rule: x is the first trading day where cumulative abnormal return reaches at least 80% of terminal CAR and the marginal abnormal-return t-statistic is below 1.65. Rows with insufficient sample size are marked low reliability rather than promoted as claims.