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global/pisa/PISA_README.md

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+# PISA Data - Programme for International Student Assessment
+
+## Overview
+This directory contains processed PISA (Programme for International Student Assessment) data from 2006-2022, optimized for research and analysis.
+
+## Structure
+- `trend_analysis/` - Multi-year trend analysis datasets
+- `spain_trends/` - Spain-specific trend data
+- `processing_metadata.json` - Processing metadata and variable information
+
+## Data Description
+- **Source**: OECD PISA Programme
+- **Years**: 2006, 2009, 2012, 2015, 2018, 2022
+- **Format**: Parquet files for optimal performance
+- **Key Variables**: Academic performance, socioeconomic status, study habits, motivation
+
+## Usage
+The processed data is ready for analysis with modern data science tools (Polars, Pandas, etc.).
+
+## Citation
+If you use this data in your research, please cite:
+- OECD (2023), Programme for International Student Assessment (PISA)
+- This processed dataset: `victoriano/social-sciences-microdata`
+
+## Processing Details
+Data was processed using the young-lazy-people analysis framework:
+- Standardized variable names across years
+- Unified country codes and identifiers
+- Optimized data types for analysis
+- Spain-specific trend extraction
+
+## License
+This processed data follows the OECD PISA data usage guidelines.

global/pisa/processing_metadata.json

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+{
+  "processing_date": "2025-07-03T23:21:43.275322",
+  "processed_years": [
+    2015,
+    2018,
+    2022
+  ],
+  "file_formats": {
+    "2015": "sav",
+    "2018": "sav",
+    "2022": "sav"
+  },
+  "key_variables": {
+    "student_id": [
+      "CNTSTUID",
+      "STIDSTD",
+      "STUID",
+      "STDID",
+      "StIDStd"
+    ],
+    "country": [
+      "CNT",
+      "CNTRYID",
+      "COUNTRY"
+    ],
+    "school_id": [
+      "CNTSCHID",
+      "SCHOOLID",
+      "SCHID",
+      "SCID"
+    ],
+    "gender": [
+      "ST004D01T",
+      "ST04Q01",
+      "ST003D01T"
+    ],
+    "age": [
+      "AGE",
+      "ST003Q02TA",
+      "ST003D02T"
+    ],
+    "grade": [
+      "ST001D01T",
+      "ST01Q01"
+    ],
+    "escs": [
+      "ESCS"
+    ],
+    "wealth": [
+      "WEALTH"
+    ],
+    "cultural": [
+      "CULTPOSS"
+    ],
+    "homework_time": [
+      "TMINS",
+      "ST057Q01TA",
+      "ST57Q01",
+      "ST046Q01TA"
+    ],
+    "motivation": [
+      "MOTIVAT",
+      "MOTIVA"
+    ],
+    "belong": [
+      "BELONG"
+    ],
+    "perseverance": [
+      "PERSEV",
+      "GRIT"
+    ],
+    "math_score": [
+      "PV1MATH",
+      "PV2MATH",
+      "PV3MATH",
+      "PV4MATH",
+      "PV5MATH"
+    ],
+    "read_score": [
+      "PV1READ",
+      "PV2READ",
+      "PV3READ",
+      "PV4READ",
+      "PV5READ"
+    ],
+    "science_score": [
+      "PV1SCIE",
+      "PV2SCIE",
+      "PV3SCIE",
+      "PV4SCIE",
+      "PV5SCIE"
+    ]
+  },
+  "output_files": {
+    "combined_international": "trend_analysis/pisa_combined_2006_2022.parquet",
+    "spain_trends": "spain_trends/spain_trends_2006_2022.parquet",
+    "spain_summary": "spain_trends/spain_summary_by_year.csv"
+  },
+  "notes": {
+    "harmonization": "Variables harmonized across years using key_variables mapping",
+    "spain_filtering": "Spain identified using country codes: ESP, ES, 724",
+    "missing_data": "Missing values preserved as null/NaN in Parquet format",
+    "optimization": "Uses column selection and Polars for efficient processing"
+  }
+}

global/pisa/spain_trends/spain_summary_by_year.csv

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+pisa_year,student_count,avg_homework_minutes,avg_math_score,avg_socioeconomic_status
+2015,6736,1701.6861807387863,490.4381687945368,-0.4491393381251871
+2018,35943,1712.6643448966586,490.69067637648493,-0.04343081326154719
+2022,30800,,480.9150405844156,0.02354851254722072

global/pisa/spain_trends/spain_trends_2006_2022.parquet

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+version https://git-lfs.github.com/spec/v1
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+size 1729055

global/pisa/trend_analysis/pisa_2015_harmonized.parquet

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+oid sha256:72b8f9838cf79d99bdbb067e45d9fe35e6af7695e4729efe02498be0cad81fd7
+size 13381178

global/pisa/trend_analysis/pisa_2018_harmonized.parquet

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+oid sha256:e8c913fd84b92c7ea0cba8aeb4a1f6621c4ec226cc989219cffc08dd80f347c6
+size 14917898

global/pisa/trend_analysis/pisa_2022_harmonized.parquet

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+oid sha256:af6debe8edc45c6c4c116ba73b288bcaa6891b905338fc3171e13ccad7696379
+size 12317323

global/pisa/trend_analysis/pisa_combined_2006_2022.parquet

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+oid sha256:22e4fdd9c2f09ff144d40635cbe2077d8001a590e91b219170ee256b4a4f1dd9
+size 40621921