{
  "title": "Auto MPG: historical statistics investigation subset",
  "citation": "Quinlan, R. (1993). Auto MPG [Dataset]. UCI Machine Learning Repository. https://doi.org/10.24432/C5859H.",
  "source": "https://archive.ics.uci.edu/dataset/9/auto%2Bmpg",
  "download": "https://archive.ics.uci.edu/static/public/9/auto%2Bmpg.zip",
  "license": "CC BY 4.0",
  "licenseUrl": "https://creativecommons.org/licenses/by/4.0/",
  "retrieved": "2026-10-26",
  "sourceFile": "auto-mpg.data",
  "sha256": "48b830e11feee5572525f8f1691ddb9d38d3d7b7063edcd8fca672c2a5e17d8d",
  "upstreamExclusion": "The 398-row processed UCI file removed eight original records with missing MPG. Source-row identities refer to this processed file, not the 406-row original.",
  "changes": "Selected model_year70 through74 (152 rows); retained MPG, weight, horsepower and car name; added 1-based processed-file sourceRow; renamed columns; represented missing horsepower as JSON null or blank CSV. Numeric input values otherwise unchanged.",
  "partition": "1970–72 development:85 raw/84 complete;1973 validation:40 raw/40 complete;1974 transfer:27 raw/26 complete. Missing horsepower source rows33 and127. This deliberate year split is not random sampling or a secure held-out examination.",
  "scaling": "Model predictors weight/1000 and horsepower/100. Optional response100/mpg is gallons per100 miles. Original data values remain available.",
  "measurementNote": "MPG is documented as city-cycle fuel consumption. Original metadata does not fully specify collection, independence or measurement procedures; do not infer contemporary fleet performance or causal effects."
}