Methodology
Statistical conventions used across our six indicator groups for annual aggregation, real interest rate deflation, and historical series splicing.
| Indicator Group | Dataset Code & Cadence | Calculation & Convention |
|---|---|---|
| Benchmark Policy Rates | BIS WS_CBPOL Monthly (Year-end in annual tables) | Because policy rates are target/stock variables rather than flow totals, annual tables report the year-end (December or latest available month) rate alongside the intra-year minimum and maximum corridor. |
| Ex-Post Real Policy Rates | WS_CBPOL - WS_LONG_CPI Annual & Monthly | Computed as Nominal Policy Rate (t) minus Headline CPI YoY % (t). The Real Interest Rate Explorer also computes the exact Fisher equation ((1 + i) / (1 + pi)) - 1. |
| Central Bank Balance Sheets | BIS WS_CBTA (USD & % GDP) Annual / Quarterly / Monthly | Extracted from break-adjusted BIS total central bank asset series (COMP_METHOD=B). Pre-modern annual series are spliced with higher-frequency modern releases. |
| Effective Exchange Rates & Reserves | BIS WS_EER & WB FI.RES.TOTL.CD Monthly (REER) & Annual (Reserves) | REER (2020 = 100) joins the BIS Narrow basket (1964-1993) with the Broad 64-economy CPI-deflated basket (1994-present). Reserves include monetary gold valued at year-end London market prices. |
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