{
  "record_id": "281b355bd08bd1b8b228829d9c97b819d0d2a4d1",
  "eligible": true,
  "exclusion_reason": null,
  "study": {
    "title": "Impact of Air Pollution on Property Values: A Hedonic Price Study",
    "year": 2013,
    "doi": "10.23917/jep.v14i1.150",
    "country": "Indonesia",
    "region_city": "Daerah Istimewa Yogyakarta (city of Yogyakarta and Sleman regency sub-districts with highest CO concentration)",
    "sample_start": null,
    "sample_end": null,
    "property_type": "single_family",
    "price_type": "transaction",
    "data_source": "Structured questionnaire survey of 250 households (self-reported sales price of house); CO from Badan Lingkungan Hidup DIY ambient monitoring 2010",
    "document_type": "journal",
    "estimators": ["OLS"],
    "spatial_method": "none",
    "time_fe": false,
    "location_fe": false,
    "se_type": "unknown",
    "n_obs_total": 250,
    "ai_methods": [],
    "notes": "Table 4 (p. 9): first-stage hedonic price function, ln PPRICE on logged characteristics, Full Model and Fit Model. Values in parentheses are not labelled in the table note; magnitudes (e.g. 0.553 with (7.840)***) indicate t-statistics. Star legend not printed; text says significance at 5 percent and CO at 1 percent, so stars assumed ***=1%, **=5%, *=10%. Table 6 (inverse demand, dependent = ln implicit price) is a second-stage regression and is NOT extracted. Survey year not stated; CO data refer to 2010. Property type: houses with plot area (single-family assumed)."
  },
  "models": [
    {
      "model_id": "T4-full",
      "table": "4",
      "column": "Full Model",
      "page": 9,
      "dep_var": "ln PPRICE (sales price of house, Rupiahs)",
      "dep_transform": "log",
      "estimator": "OLS",
      "n_obs": 250,
      "r2": 0.766,
      "se_or_t_in_parentheses": "t",
      "sample_subset": "full specification; R2 printed is Adjusted R2"
    },
    {
      "model_id": "T4-fit",
      "table": "4",
      "column": "Fit Model",
      "page": 9,
      "dep_var": "ln PPRICE (sales price of house, Rupiahs)",
      "dep_transform": "log",
      "estimator": "OLS",
      "n_obs": 250,
      "r2": 0.763,
      "se_or_t_in_parentheses": "t",
      "sample_subset": "parsimonious specification after dropping insignificant variables; R2 printed is Adjusted R2"
    }
  ],
  "coefficients": [
    {"model_id": "T4-full", "var_name_printed": "LnLANDSIZE", "taxonomy_id": "lot_size", "x_transform": "log", "x_unit": "m2", "beta": 0.553, "se": null, "t": 7.840, "p": null, "p_stars": "***", "ci_lo": null, "ci_hi": null, "page": 9, "confidence": "medium", "notes": "plot area (m2); parentheses assumed t (no legend)"},
    {"model_id": "T4-full", "var_name_printed": "LnBUILDSIZE", "taxonomy_id": "living_area", "x_transform": "log", "x_unit": "m2", "beta": 0.113, "se": null, "t": 1.380, "p": null, "p_stars": "", "ci_lo": null, "ci_hi": null, "page": 9, "confidence": "medium", "notes": "building area (m2)"},
    {"model_id": "T4-full", "var_name_printed": "LnNUMROOM", "taxonomy_id": "bedrooms", "x_transform": "log", "x_unit": "count", "beta": 0.094, "se": null, "t": 1.179, "p": null, "p_stars": "", "ci_lo": null, "ci_hi": null, "page": 9, "confidence": "medium", "notes": "number of rooms (not bedrooms specifically)"},
    {"model_id": "T4-full", "var_name_printed": "WSTRUCTDUM", "taxonomy_id": "roof_materials", "x_transform": "dummy", "x_unit": "binary", "beta": -0.067, "se": null, "t": -1.088, "p": null, "p_stars": "", "ci_lo": null, "ci_hi": null, "page": 9, "confidence": "medium", "notes": "dummy structure of wall (coding not explained; mean 1.15)"},
    {"model_id": "T4-full", "var_name_printed": "LnDISSCHOOL", "taxonomy_id": "school_distance", "x_transform": "log", "x_unit": "m", "beta": -0.071, "se": null, "t": -1.809, "p": null, "p_stars": "*", "ci_lo": null, "ci_hi": null, "page": 9, "confidence": "medium", "notes": "distance from nearest school (m)"},
    {"model_id": "T4-full", "var_name_printed": "LnDISHPITAL", "taxonomy_id": "hospital_distance", "x_transform": "log", "x_unit": "m", "beta": -0.085, "se": null, "t": -1.980, "p": null, "p_stars": "**", "ci_lo": null, "ci_hi": null, "page": 9, "confidence": "medium", "notes": "distance from nearest hospital (m)"},
    {"model_id": "T4-full", "var_name_printed": "LnDISSPMARKET", "taxonomy_id": "commercial_distance", "x_transform": "log", "x_unit": "m", "beta": 0.023, "se": null, "t": 0.560, "p": null, "p_stars": "", "ci_lo": null, "ci_hi": null, "page": 9, "confidence": "medium", "notes": "distance from supermarket (m)"},
    {"model_id": "T4-full", "var_name_printed": "LnDISREST", "taxonomy_id": "neighbourhood_amenities", "x_transform": "log", "x_unit": "m", "beta": -0.023, "se": null, "t": -0.652, "p": null, "p_stars": "", "ci_lo": null, "ci_hi": null, "page": 9, "confidence": "medium", "notes": "distance from restaurant (m)"},
    {"model_id": "T4-full", "var_name_printed": "LnDISCITY", "taxonomy_id": "cbd_distance", "x_transform": "log", "x_unit": "m", "beta": 0.054, "se": null, "t": 1.274, "p": null, "p_stars": "", "ci_lo": null, "ci_hi": null, "page": 9, "confidence": "medium", "notes": "distance from city (m)"},
    {"model_id": "T4-full", "var_name_printed": "LnDISMSTREET", "taxonomy_id": "highway_distance", "x_transform": "log", "x_unit": "m", "beta": 0.024, "se": null, "t": 1.030, "p": null, "p_stars": "", "ci_lo": null, "ci_hi": null, "page": 9, "confidence": "medium", "notes": "distance from main street (m)"},
    {"model_id": "T4-full", "var_name_printed": "GARDENDUM", "taxonomy_id": "green_space", "x_transform": "dummy", "x_unit": "binary", "beta": 0.129, "se": null, "t": 1.673, "p": null, "p_stars": "*", "ci_lo": null, "ci_hi": null, "page": 9, "confidence": "medium", "notes": "dummy for close to garden or not (public garden proximity, not private garden; mean 1.79 suggests 1/2 coding)"},
    {"model_id": "T4-full", "var_name_printed": "LnCO", "taxonomy_id": "air_pollution", "x_transform": "log", "x_unit": "ug/m3", "beta": -1.305, "se": null, "t": -13.115, "p": null, "p_stars": "***", "ci_lo": null, "ci_hi": null, "page": 9, "confidence": "medium", "notes": "concentration of carbon monoxide (µg/m3), 2010 ambient monitoring"},
    {"model_id": "T4-fit", "var_name_printed": "LnLANDSIZE", "taxonomy_id": "lot_size", "x_transform": "log", "x_unit": "m2", "beta": 0.528, "se": null, "t": 7.658, "p": null, "p_stars": "***", "ci_lo": null, "ci_hi": null, "page": 9, "confidence": "medium", "notes": "plot area (m2)"},
    {"model_id": "T4-fit", "var_name_printed": "LnBUILDSIZE", "taxonomy_id": "living_area", "x_transform": "log", "x_unit": "m2", "beta": 0.164, "se": null, "t": 2.093, "p": null, "p_stars": "**", "ci_lo": null, "ci_hi": null, "page": 9, "confidence": "medium", "notes": "building area (m2)"},
    {"model_id": "T4-fit", "var_name_printed": "LnDISSCHOOL", "taxonomy_id": "school_distance", "x_transform": "log", "x_unit": "m", "beta": -0.068, "se": null, "t": -1.910, "p": null, "p_stars": "**", "ci_lo": null, "ci_hi": null, "page": 9, "confidence": "medium", "notes": "distance from nearest school (m)"},
    {"model_id": "T4-fit", "var_name_printed": "LnDISHPITAL", "taxonomy_id": "hospital_distance", "x_transform": "log", "x_unit": "m", "beta": -0.075, "se": null, "t": -1.885, "p": null, "p_stars": "*", "ci_lo": null, "ci_hi": null, "page": 9, "confidence": "medium", "notes": "distance from nearest hospital (m)"},
    {"model_id": "T4-fit", "var_name_printed": "LnDISCITY", "taxonomy_id": "cbd_distance", "x_transform": "log", "x_unit": "m", "beta": 0.064, "se": null, "t": 1.538, "p": null, "p_stars": "", "ci_lo": null, "ci_hi": null, "page": 9, "confidence": "medium", "notes": "distance from city (m)"},
    {"model_id": "T4-fit", "var_name_printed": "LnCO", "taxonomy_id": "air_pollution", "x_transform": "log", "x_unit": "ug/m3", "beta": -1.375, "se": null, "t": -15.066, "p": null, "p_stars": "***", "ci_lo": null, "ci_hi": null, "page": 9, "confidence": "medium", "notes": "concentration of carbon monoxide (µg/m3)"}
  ]
}