| Symbol | Meaning |
|---|---|
| \(Y(t)\) | Observed outcome at time t |
| \(A=0\) | Control |
| \(A=1\) | Treated |
| \(t=1,\ldots,T_0\) | Pre-treatment times |
| \(t=T_0+1,\ldots,T\) | Post-treatment times |
| \(Y^a(t)\) | Potential outcome with treatment \(a\) at time \(t\) |
| \(X\) | Observed covariates |
| \(U\) | Unobserved covariates |