```json { "classifications": [ { "column": "Country", "role": "identifier", "confidence": 0.95, "reason": "Unique country names with 157 distinct values in 157 rows; serves as primary key" }, { "column": "Region", "role": "dimension", "confidence": 1.0, "reason": "Categorical grouping with 10 distinct regions; used for slicing and filtering" }, { "column": "Happiness Rank", "role": "dimension", "confidence": 0.85, "reason": "Ordinal ranking (1-157); used for ordering/filtering rather than aggregation" }, { "column": "Happiness Score", "role": "measure", "confidence": 1.0, "reason": "Continuous numeric score that can be averaged or aggregated" }, { "column": "Lower Confidence Interval", "role": "measure", "confidence": 1.0, "reason": "Numeric statistical bound that can be aggregated" }, { "column": "Upper Confidence Interval", "role": "measure", "confidence": 1.0, "reason": "Numeric statistical bound that can be aggregated" }, { "column": "Economy (GDP per Capita)", "role": "measure", "confidence": 1.0, "reason": "Continuous numeric value representing economic contribution; aggregatable" }, { "column": "Family", "role": "measure", "confidence": 1.0, "reason": "Continuous numeric score component; can be averaged or summed" }, { "column": "Health (Life Expectancy)", "role": "measure", "confidence": 1.0, "reason": "Continuous numeric score component; aggregatable metric" }, { "column": "Freedom", "role": "measure", "confidence": 1.0, "reason": "Continuous numeric score component; can be aggregated" }, { "column": "Trust (Government Corruption)", "role": "measure", "confidence": 1.0, "reason": "Continuous numeric score component; aggregatable metric" }, { "column": "Generosity", "role": "measure", "confidence": 1.0, "reason": "Continuous numeric score component; can be averaged or summed" }, { "column": "Dystopia Residual", "role": "measure", "confidence": 1.0, "reason": "Continuous numeric residual value; aggregatable metric" } ] } ```