The "18" in E218 refers to a set of 18 standard industrial classifications (typically NACE or NAICS codes). If one of those 18 strata has zero data for a given month (e.g., "Mining" reported no production due to a strike), the algorithm cannot calculate a weighted average. Instead of guessing, it aborts with .
: If this is on a physical screen, look for the manufacturer's name (e.g., Carrier, Siemens, Schneider Electric). Power Cycle gdp e218
4.3. Revisions, Satellite Accounts, and Valuation The "18" in E218 refers to a set