{
    "classifications": [
        {
            "column": "Student_ID",
            "role": "identifier",
            "confidence": 0.98,
            "reason": "Unique per row, primary key"
        },
        {
            "column": "Age",
            "role": "dimension",
            "confidence": 0.7,
            "reason": "Low-cardinality integer (12 values) used for slicing/grouping by age"
        },
        {
            "column": "Gender",
            "role": "dimension",
            "confidence": 0.98,
            "reason": "Low-cardinality category"
        },
        {
            "column": "Academic_Level",
            "role": "dimension",
            "confidence": 0.98,
            "reason": "Low-cardinality category"
        },
        {
            "column": "Primary_Platform",
            "role": "dimension",
            "confidence": 0.98,
            "reason": "Category of platform"
        },
        {
            "column": "Daily_Usage_Hours",
            "role": "measure",
            "confidence": 0.93,
            "reason": "Continuous numeric quantity of hours"
        },
        {
            "column": "Weekend_Extra_Hours",
            "role": "measure",
            "confidence": 0.93,
            "reason": "Continuous numeric quantity of hours"
        },
        {
            "column": "Device_Type",
            "role": "dimension",
            "confidence": 0.98,
            "reason": "Low-cardinality category"
        },
        {
            "column": "Sleep_Duration_Hours",
            "role": "measure",
            "confidence": 0.93,
            "reason": "Continuous numeric hours, averaged"
        },
        {
            "column": "Sleep_Quality_Score",
            "role": "measure",
            "confidence": 0.85,
            "reason": "Small 1-5 rating scale, averaged"
        },
        {
            "column": "Late_Night_Usage",
            "role": "dimension",
            "confidence": 0.97,
            "reason": "Boolean flag"
        },
        {
            "column": "Social_Comparison_Frequency",
            "role": "dimension",
            "confidence": 0.95,
            "reason": "Ordinal categorical label"
        },
        {
            "column": "Perceived_Stress_Score",
            "role": "measure",
            "confidence": 0.9,
            "reason": "Numeric score, averaged"
        },
        {
            "column": "Mental_Health_Index",
            "role": "measure",
            "confidence": 0.9,
            "reason": "Numeric index score, averaged"
        },
        {
            "column": "Academic_Performance_GPA",
            "role": "measure",
            "confidence": 0.92,
            "reason": "Numeric GPA, averaged"
        },
        {
            "column": "Overall_Impact",
            "role": "dimension",
            "confidence": 0.97,
            "reason": "Low-cardinality categorical outcome label"
        }
    ]
}