How alternative and standard base periods work
| ABP quarter 1 | ABP quarter 2 | ABP quarter 3 | ABP quarter 4 | ABP quarter 5 | Current quarter |
|---|---|---|---|---|---|
| Alternative base period (ABP) | |||||
| SBP quarter 1 | SBP quarter 2 | SBP quarter 3 | SBP quarter 4 | Lag quarter | Current quarter |
| Standard base period (SBP) | |||||