```json { "classifications": [ { "column": "Overall rank", "role": "dimension", "confidence": 0.85, "reason": "Ordinal ranking used for sorting/filtering; not aggregated or used as a join key" }, { "column": "Country or region", "role": "dimension", "confidence": 0.95, "reason": "Categorical field used to group by and slice data; primary axis for analysis" }, { "column": "Score", "role": "measure", "confidence": 0.95, "reason": "Numeric happiness score that can be aggregated (avg, sum) across countries" }, { "column": "GDP per capita", "role": "measure", "confidence": 0.9, "reason": "Continuous numeric value representing economic metric; suitable for aggregation" }, { "column": "Social support", "role": "measure", "confidence": 0.9, "reason": "Numeric metric that can be averaged or summed across groups" }, { "column": "Healthy life expectancy", "role": "measure", "confidence": 0.9, "reason": "Numeric health metric suitable for statistical aggregation" }, { "column": "Freedom to make life choices", "role": "measure", "confidence": 0.9, "reason": "Numeric score representing freedom metric; can be aggregated" }, { "column": "Generosity", "role": "measure", "confidence": 0.9, "reason": "Numeric metric that can be averaged or compared across countries" }, { "column": "Perceptions of corruption", "role": "measure", "confidence": 0.9, "reason": "Numeric perception score suitable for aggregation and comparison" } ] } ```