query_regime

com.twmarketdata/tw-market-data · Verify this server

The Taiwan business-cycle light (NDC monitoring indicator) as a monthly series. ★ THIS IS A REVISED FIGURE, NOT A POINT-IN-TIME ONE. Every response carries `revision_basis: as_revised`. Our source holds exactly one row per month — the CURRENT value, not the value as first published — and it records no publication date. ★ `as_of` IS REFUSED, AND THE REFUSAL IS THE POINT. There is no honest point-in-time answer here yet. Do NOT work around it by asking for a date range that ends at your as_of: the NDC publishes a month's light about 27 days AFTER that month ends, so a range ending 2026-03-05 still contains the February light that was not public until late March. That is look-ahead, it raises no error, and it makes a backtest look better than it was. ★ USE IT FOR CONTEXT, NOT AS A BACKTEST INPUT. Describing what regime the market is in today, or labelling historical periods for narrative, is fine. Feeding it into a simulated decision that claims to have been made at the time is not. Args: optional start/end (YYYY-MM-DD), limit. `as_of` returns a refusal explaining the above.