Two important predictors in RD are the forcing variable and ().

问答题The DID model can be described as:Y¡ =a +βDi+yt¡+ δ(D¡.tj)+ε, where D¡ means intervention,t¡meanstime. Which parameter in the formula represents the true treatment effect

问答题The DID model can be described as:Y¡ =a βDi yt¡ δ(D¡.tj) ε, where D¡ means int