{
 "country": "CH",
 "country_iso3": "CHE",
 "label": {
  "de": "Schweiz",
  "en": "Switzerland"
 },
 "note": {
  "de": "Die Schweizer Ziehungsschichten unterscheiden nur die Unterrichtssprache (deutsch, franzoesisch, italienisch), nicht die Kantone — kantonale Werte sind aus den oeffentlichen OECD-Mikrodaten nicht zu gewinnen. Die drei Sprachregionen decken die Stichprobe vollstaendig ab. Im File 2025 ist die Ziehungsschicht fuer die Schweiz komplett maskiert — dieser Zyklus fehlt deshalb.",
  "en": "The Swiss sampling strata only distinguish the language of instruction (German, French, Italian), not cantons — cantonal figures cannot be derived from the public OECD microdata. The three language regions cover the whole sample. In the 2025 file the stratum is fully masked for Switzerland, so that cycle is missing."
 },
 "generated": "2026-09-08",
 "min_students": 15,
 "cycles": [
  2015,
  2018,
  2022
 ],
 "region_source": {
  "2015": "stratum",
  "2018": "stratum",
  "2022": "stratum"
 },
 "source": "OECD PISA Scientific Use Files (Student questionnaire, 2015, 2018, 2022). Eigene Berechnung: Mittelwerte ueber alle Plausible Values, Standardfehler per Balanced Repeated Replication (Fay 0.5, 80 Replikate). Erzeugt mit scripts/compute_pisa_regional_migration.py",
 "regions": {
  "CH-DE": {
   "de": "Deutschsprachige Schweiz",
   "en": "German-speaking Switzerland",
   "adjudicated": false,
   "residual": false
  },
  "CH-FR": {
   "de": "Französischsprachige Schweiz",
   "en": "French-speaking Switzerland",
   "adjudicated": false,
   "residual": false
  },
  "CH-IT": {
   "de": "Italienischsprachige Schweiz",
   "en": "Italian-speaking Switzerland",
   "adjudicated": false,
   "residual": false
  }
 },
 "rows": [
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   "year": 2015,
   "region": "CH-DE",
   "group": "overall",
   "students": 3531,
   "weighted_share": 100.0,
   "math": 518.4,
   "math_se": 3.5,
   "reading": 485.1,
   "reading_se": 3.3,
   "science": 500.0,
   "science_se": 3.4,
   "escs": 0.108,
   "home_test_lang_share": 74.0
  },
  {
   "year": 2015,
   "region": "CH-DE",
   "group": "native",
   "students": 2498,
   "weighted_share": 70.48,
   "math": 537.4,
   "math_se": 3.5,
   "reading": 503.2,
   "reading_se": 3.3,
   "science": 522.2,
   "science_se": 3.1,
   "escs": 0.279,
   "home_test_lang_share": 91.8
  },
  {
   "year": 2015,
   "region": "CH-DE",
   "group": "second_generation",
   "students": 657,
   "weighted_share": 18.96,
   "math": 475.3,
   "math_se": 5.7,
   "reading": 444.2,
   "reading_se": 5.7,
   "science": 448.3,
   "science_se": 5.6,
   "escs": -0.425,
   "home_test_lang_share": 26.9
  },
  {
   "year": 2015,
   "region": "CH-DE",
   "group": "first_generation",
   "students": 279,
   "weighted_share": 7.93,
   "math": 480.0,
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   "reading": 443.7,
   "reading_se": 8.8,
   "science": 455.7,
   "science_se": 8.5,
   "escs": -0.093,
   "home_test_lang_share": 33.5
  },
  {
   "year": 2015,
   "region": "CH-FR",
   "group": "overall",
   "students": 1307,
   "weighted_share": 100.0,
   "math": 526.0,
   "math_se": 5.7,
   "reading": 507.5,
   "reading_se": 6.4,
   "science": 517.5,
   "science_se": 5.9,
   "escs": 0.205,
   "home_test_lang_share": 72.3
  },
  {
   "year": 2015,
   "region": "CH-FR",
   "group": "native",
   "students": 797,
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   "math": 545.6,
   "math_se": 5.5,
   "reading": 527.2,
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   "escs": 0.47,
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  },
  {
   "year": 2015,
   "region": "CH-FR",
   "group": "second_generation",
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   "math": 499.9,
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   "reading": 481.1,
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   "science": 485.0,
   "science_se": 8.0,
   "escs": -0.208,
   "home_test_lang_share": 47.7
  },
  {
   "year": 2015,
   "region": "CH-FR",
   "group": "first_generation",
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   "weighted_share": 14.67,
   "math": 494.1,
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   "reading": 473.9,
   "reading_se": 9.0,
   "science": 478.3,
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   "escs": -0.209,
   "home_test_lang_share": 30.4
  },
  {
   "year": 2015,
   "region": "CH-IT",
   "group": "overall",
   "students": 1022,
   "weighted_share": 100.0,
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   "home_test_lang_share": 83.8
  },
  {
   "year": 2015,
   "region": "CH-IT",
   "group": "native",
   "students": 660,
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   "math": 541.4,
   "math_se": 5.5,
   "reading": 505.9,
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   "science_se": 5.6,
   "escs": 0.427,
   "home_test_lang_share": 91.8
  },
  {
   "year": 2015,
   "region": "CH-IT",
   "group": "second_generation",
   "students": 208,
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   "reading": 482.5,
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   "science": 491.6,
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   "escs": -0.154,
   "home_test_lang_share": 68.5
  },
  {
   "year": 2015,
   "region": "CH-IT",
   "group": "first_generation",
   "students": 147,
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   "math": 506.7,
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   "reading": 472.4,
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   "science": 480.8,
   "science_se": 9.8,
   "escs": 0.038,
   "home_test_lang_share": 62.9
  },
  {
   "year": 2018,
   "region": "CH-DE",
   "group": "overall",
   "students": 3455,
   "weighted_share": 100.0,
   "math": 511.9,
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   "reading": 476.5,
   "reading_se": 3.9,
   "science": 489.9,
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   "escs": -0.053,
   "home_test_lang_share": 71.6
  },
  {
   "year": 2018,
   "region": "CH-DE",
   "group": "native",
   "students": 2311,
   "weighted_share": 66.95,
   "math": 531.0,
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   "reading": 496.9,
   "reading_se": 3.7,
   "science": 511.5,
   "science_se": 3.4,
   "escs": 0.158,
   "home_test_lang_share": 91.8
  },
  {
   "year": 2018,
   "region": "CH-DE",
   "group": "second_generation",
   "students": 690,
   "weighted_share": 19.92,
   "math": 474.3,
   "math_se": 5.5,
   "reading": 439.2,
   "reading_se": 5.5,
   "science": 446.3,
   "science_se": 5.3,
   "escs": -0.557,
   "home_test_lang_share": 26.4
  },
  {
   "year": 2018,
   "region": "CH-DE",
   "group": "first_generation",
   "students": 346,
   "weighted_share": 10.03,
   "math": 474.7,
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   "reading": 432.6,
   "reading_se": 8.3,
   "science": 448.0,
   "science_se": 8.1,
   "escs": -0.416,
   "home_test_lang_share": 28.0
  },
  {
   "year": 2018,
   "region": "CH-FR",
   "group": "overall",
   "students": 1412,
   "weighted_share": 100.0,
   "math": 521.7,
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   "reading": 500.4,
   "reading_se": 5.2,
   "science": 507.6,
   "science_se": 5.2,
   "escs": 0.057,
   "home_test_lang_share": 74.6
  },
  {
   "year": 2018,
   "region": "CH-FR",
   "group": "native",
   "students": 801,
   "weighted_share": 57.06,
   "math": 540.4,
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   "reading": 521.5,
   "reading_se": 6.2,
   "science": 529.6,
   "science_se": 5.7,
   "escs": 0.349,
   "home_test_lang_share": 94.1
  },
  {
   "year": 2018,
   "region": "CH-FR",
   "group": "second_generation",
   "students": 349,
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   "math": 501.2,
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   "reading": 479.0,
   "reading_se": 6.9,
   "science": 478.0,
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   "home_test_lang_share": 61.5
  },
  {
   "year": 2018,
   "region": "CH-FR",
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   "math": 497.0,
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   "reading": 468.1,
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   "science": 482.1,
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   "home_test_lang_share": 27.1
  },
  {
   "year": 2018,
   "region": "CH-IT",
   "group": "overall",
   "students": 955,
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   "math": 527.7,
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   "reading": 495.2,
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   "science": 500.9,
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   "escs": 0.174,
   "home_test_lang_share": 84.8
  },
  {
   "year": 2018,
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   "group": "native",
   "students": 619,
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   "math": 536.7,
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   "reading": 506.1,
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   "science": 512.2,
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  },
  {
   "year": 2018,
   "region": "CH-IT",
   "group": "second_generation",
   "students": 195,
   "weighted_share": 20.09,
   "math": 505.3,
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   "reading": 472.7,
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   "science": 474.4,
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   "escs": -0.234,
   "home_test_lang_share": 71.9
  },
  {
   "year": 2018,
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   "students": 122,
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   "escs": -0.02,
   "home_test_lang_share": 64.4
  },
  {
   "year": 2022,
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   "students": 4148,
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   "home_test_lang_share": 69.3
  },
  {
   "year": 2022,
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   "students": 2750,
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   "math": 526.8,
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   "home_test_lang_share": 90.1
  },
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   "year": 2022,
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   "home_test_lang_share": 22.0
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   "year": 2022,
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  },
  {
   "year": 2022,
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  {
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  },
  {
   "year": 2022,
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  },
  {
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  },
  {
   "year": 2022,
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   "science": 505.6,
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   "home_test_lang_share": 76.9
  }
 ]
}