{
 "record_id": "fdf3432efb95e96e6e45a3ba105603f17a38d366",
 "eligible": true,
 "exclusion_reason": null,
 "study": {
  "title": "Hedonic valuation of marginal willingness to pay for air quality improvement",
  "year": 2012,
  "doi": "10.20885/ejem.v4i2.3318",
  "country": "Indonesia",
  "region_city": "Yogyakarta Special Territory (Yogyakarta City and Gunungkidul high-PM10 sub-districts)",
  "sample_start": 2010,
  "sample_end": 2010,
  "property_type": "single_family",
  "price_type": "transaction",
  "data_source": "Household survey of 250 residences in highest-PM10 sub-districts (self-reported sales price); PM10 from Badan Lingkungan Hidup ambient monitoring 2010, kriged",
  "document_type": "journal",
  "estimators": [
   "OLS"
  ],
  "spatial_method": "none",
  "time_fe": false,
  "location_fe": false,
  "se_type": "unknown",
  "n_obs_total": 250,
  "ai_methods": [],
  "notes": "Economic Journal of Emerging Markets 4(2) 163-172. Log-log hedonic (Table 3, p.7) with t-statistics in parentheses; Table 5 (inverse demand / second stage, p.8) not extracted. Survey year not stated (air data 2010; references accessed Feb 2012) -> sample years approximate. Price in Rupiah (mean ~3E+08). Stars legend not printed."
 },
 "models": [
  {
   "model_id": "T3-c1",
   "table": "3",
   "column": "1 (Full Model)",
   "page": 7,
   "dep_var": "ln(PPRICE) sales price of house (Rupiah)",
   "dep_transform": "log",
   "estimator": "OLS",
   "n_obs": 250,
   "r2": 0.606,
   "se_or_t_in_parentheses": "t",
   "sample_subset": "full specification; 250 household observations in Yogyakarta Special Territory; adjusted R2 printed (0.606)"
  },
  {
   "model_id": "T3-c2",
   "table": "3",
   "column": "2 (Fit Model)",
   "page": 7,
   "dep_var": "ln(PPRICE) sales price of house (Rupiah)",
   "dep_transform": "log",
   "estimator": "OLS",
   "n_obs": 250,
   "r2": 0.606,
   "se_or_t_in_parentheses": "t",
   "sample_subset": "'fit model': insignificant variables dropped; 250 household observations in Yogyakarta Special Territory; adjusted R2 printed (0.606)"
  }
 ],
 "coefficients": [
  {
   "model_id": "T3-c1",
   "var_name_printed": "LnLANDSIZE",
   "taxonomy_id": "lot_size",
   "x_transform": "log",
   "x_unit": "m2",
   "beta": 0.397,
   "se": null,
   "t": 4.381,
   "p": null,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 7,
   "confidence": "high",
   "notes": "plot area in m2, log; values in parentheses are t-statistics (no legend printed; consistent with coef/SE, e.g. constant 17.181 (17.689)); stars legend not printed, text implies *** 1%, ** 5%, * 10%"
  },
  {
   "model_id": "T3-c1",
   "var_name_printed": "LnBUILDSIZE",
   "taxonomy_id": "living_area",
   "x_transform": "log",
   "x_unit": "m2",
   "beta": 0.353,
   "se": null,
   "t": 3.404,
   "p": null,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 7,
   "confidence": "high",
   "notes": "building area in m2, log; values in parentheses are t-statistics (no legend printed; consistent with coef/SE, e.g. constant 17.181 (17.689)); stars legend not printed, text implies *** 1%, ** 5%, * 10%"
  },
  {
   "model_id": "T3-c1",
   "var_name_printed": "LnNUMROOM",
   "taxonomy_id": "bedrooms",
   "x_transform": "log",
   "x_unit": "count",
   "beta": 0.116,
   "se": null,
   "t": 1.121,
   "p": null,
   "p_stars": "",
   "ci_lo": null,
   "ci_hi": null,
   "page": 7,
   "confidence": "high",
   "notes": "number of rooms (all rooms, not bedrooms specifically), log; values in parentheses are t-statistics (no legend printed; consistent with coef/SE, e.g. constant 17.181 (17.689)); stars legend not printed, text implies *** 1%, ** 5%, * 10%"
  },
  {
   "model_id": "T3-c1",
   "var_name_printed": "WSTRUCTDUM",
   "taxonomy_id": "roof_materials",
   "x_transform": "dummy",
   "x_unit": "binary",
   "beta": -0.081,
   "se": null,
   "t": -1.012,
   "p": null,
   "p_stars": "",
   "ci_lo": null,
   "ci_hi": null,
   "page": 7,
   "confidence": "high",
   "notes": "dummy for wall structure (coding not described; mean 1.15); values in parentheses are t-statistics (no legend printed; consistent with coef/SE, e.g. constant 17.181 (17.689)); stars legend not printed, text implies *** 1%, ** 5%, * 10%"
  },
  {
   "model_id": "T3-c1",
   "var_name_printed": "LnDISSCHOOL",
   "taxonomy_id": "school_distance",
   "x_transform": "log",
   "x_unit": "m",
   "beta": -0.046,
   "se": null,
   "t": -0.895,
   "p": null,
   "p_stars": "",
   "ci_lo": null,
   "ci_hi": null,
   "page": 7,
   "confidence": "high",
   "notes": "distance from residence to nearest school, metres, log; values in parentheses are t-statistics (no legend printed; consistent with coef/SE, e.g. constant 17.181 (17.689)); stars legend not printed, text implies *** 1%, ** 5%, * 10%"
  },
  {
   "model_id": "T3-c1",
   "var_name_printed": "LnDISHPITAL",
   "taxonomy_id": "hospital_distance",
   "x_transform": "log",
   "x_unit": "m",
   "beta": -0.163,
   "se": null,
   "t": -2.936,
   "p": null,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 7,
   "confidence": "high",
   "notes": "distance to nearest hospital, metres, log; values in parentheses are t-statistics (no legend printed; consistent with coef/SE, e.g. constant 17.181 (17.689)); stars legend not printed, text implies *** 1%, ** 5%, * 10%"
  },
  {
   "model_id": "T3-c1",
   "var_name_printed": "LnDISSPMARKET",
   "taxonomy_id": "commercial_distance",
   "x_transform": "log",
   "x_unit": "m",
   "beta": 0.103,
   "se": null,
   "t": 1.918,
   "p": null,
   "p_stars": "*",
   "ci_lo": null,
   "ci_hi": null,
   "page": 7,
   "confidence": "high",
   "notes": "distance to nearest supermarket, metres, log; values in parentheses are t-statistics (no legend printed; consistent with coef/SE, e.g. constant 17.181 (17.689)); stars legend not printed, text implies *** 1%, ** 5%, * 10%"
  },
  {
   "model_id": "T3-c1",
   "var_name_printed": "LnDISREST",
   "taxonomy_id": "neighbourhood_amenities",
   "x_transform": "log",
   "x_unit": "m",
   "beta": -0.155,
   "se": null,
   "t": -3.606,
   "p": null,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 7,
   "confidence": "high",
   "notes": "distance to nearest restaurant, metres, log; values in parentheses are t-statistics (no legend printed; consistent with coef/SE, e.g. constant 17.181 (17.689)); stars legend not printed, text implies *** 1%, ** 5%, * 10%"
  },
  {
   "model_id": "T3-c1",
   "var_name_printed": "LnDISCITY",
   "taxonomy_id": "cbd_distance",
   "x_transform": "log",
   "x_unit": "m",
   "beta": 0.039,
   "se": null,
   "t": 0.68,
   "p": null,
   "p_stars": "",
   "ci_lo": null,
   "ci_hi": null,
   "page": 7,
   "confidence": "high",
   "notes": "distance from city (centre), metres, log; values in parentheses are t-statistics (no legend printed; consistent with coef/SE, e.g. constant 17.181 (17.689)); stars legend not printed, text implies *** 1%, ** 5%, * 10%"
  },
  {
   "model_id": "T3-c1",
   "var_name_printed": "LnDISMSTREET",
   "taxonomy_id": "highway_distance",
   "x_transform": "log",
   "x_unit": "m",
   "beta": 0.091,
   "se": null,
   "t": 3.089,
   "p": null,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 7,
   "confidence": "high",
   "notes": "distance to main street, metres, log (positive = farther from main road is dearer); values in parentheses are t-statistics (no legend printed; consistent with coef/SE, e.g. constant 17.181 (17.689)); stars legend not printed, text implies *** 1%, ** 5%, * 10%"
  },
  {
   "model_id": "T3-c1",
   "var_name_printed": "GARDENDUM",
   "taxonomy_id": "green_space",
   "x_transform": "dummy",
   "x_unit": "binary",
   "beta": 0.261,
   "se": null,
   "t": 2.637,
   "p": null,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 7,
   "confidence": "high",
   "notes": "dummy for being close to a garden (coded 1/2 in Table 2, mean 1.79); values in parentheses are t-statistics (no legend printed; consistent with coef/SE, e.g. constant 17.181 (17.689)); stars legend not printed, text implies *** 1%, ** 5%, * 10%"
  },
  {
   "model_id": "T3-c1",
   "var_name_printed": "LnPM10",
   "taxonomy_id": "air_pollution",
   "x_transform": "log",
   "x_unit": "ppm",
   "beta": -1.355,
   "se": null,
   "t": -2.355,
   "p": null,
   "p_stars": "**",
   "ci_lo": null,
   "ci_hi": null,
   "page": 7,
   "confidence": "medium",
   "notes": "PM10 concentration (printed unit 'ppm', mean 1,223.12), log; 2010 ambient monitoring data, kriged; values in parentheses are t-statistics (no legend printed; consistent with coef/SE, e.g. constant 17.181 (17.689)); stars legend not printed, text implies *** 1%, ** 5%, * 10%; Full-model LnPM10 elasticity -1.355 differs sharply from fit-model -0.320 and text quotes -0.32"
  },
  {
   "model_id": "T3-c2",
   "var_name_printed": "LnLANDSIZE",
   "taxonomy_id": "lot_size",
   "x_transform": "log",
   "x_unit": "m2",
   "beta": 0.396,
   "se": null,
   "t": 4.432,
   "p": null,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 7,
   "confidence": "high",
   "notes": "plot area in m2, log; values in parentheses are t-statistics (no legend printed; consistent with coef/SE, e.g. constant 17.181 (17.689)); stars legend not printed, text implies *** 1%, ** 5%, * 10%"
  },
  {
   "model_id": "T3-c2",
   "var_name_printed": "LnBUILDSIZE",
   "taxonomy_id": "living_area",
   "x_transform": "log",
   "x_unit": "m2",
   "beta": 0.393,
   "se": null,
   "t": 3.915,
   "p": null,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 7,
   "confidence": "high",
   "notes": "building area in m2, log; values in parentheses are t-statistics (no legend printed; consistent with coef/SE, e.g. constant 17.181 (17.689)); stars legend not printed, text implies *** 1%, ** 5%, * 10%"
  },
  {
   "model_id": "T3-c2",
   "var_name_printed": "LnDISHPITAL",
   "taxonomy_id": "hospital_distance",
   "x_transform": "log",
   "x_unit": "m",
   "beta": -0.16,
   "se": null,
   "t": -3.115,
   "p": null,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 7,
   "confidence": "high",
   "notes": "distance to nearest hospital, metres, log; values in parentheses are t-statistics (no legend printed; consistent with coef/SE, e.g. constant 17.181 (17.689)); stars legend not printed, text implies *** 1%, ** 5%, * 10%"
  },
  {
   "model_id": "T3-c2",
   "var_name_printed": "LnDISSPMARKET",
   "taxonomy_id": "commercial_distance",
   "x_transform": "log",
   "x_unit": "m",
   "beta": 0.103,
   "se": null,
   "t": 1.975,
   "p": null,
   "p_stars": "**",
   "ci_lo": null,
   "ci_hi": null,
   "page": 7,
   "confidence": "high",
   "notes": "distance to nearest supermarket, metres, log; values in parentheses are t-statistics (no legend printed; consistent with coef/SE, e.g. constant 17.181 (17.689)); stars legend not printed, text implies *** 1%, ** 5%, * 10%"
  },
  {
   "model_id": "T3-c2",
   "var_name_printed": "LnDISREST",
   "taxonomy_id": "neighbourhood_amenities",
   "x_transform": "log",
   "x_unit": "m",
   "beta": -0.16,
   "se": null,
   "t": -3.999,
   "p": null,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 7,
   "confidence": "high",
   "notes": "distance to nearest restaurant, metres, log; values in parentheses are t-statistics (no legend printed; consistent with coef/SE, e.g. constant 17.181 (17.689)); stars legend not printed, text implies *** 1%, ** 5%, * 10%"
  },
  {
   "model_id": "T3-c2",
   "var_name_printed": "LnDISMSTREET",
   "taxonomy_id": "highway_distance",
   "x_transform": "log",
   "x_unit": "m",
   "beta": 0.092,
   "se": null,
   "t": 3.153,
   "p": null,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 7,
   "confidence": "high",
   "notes": "distance to main street, metres, log (positive = farther from main road is dearer); values in parentheses are t-statistics (no legend printed; consistent with coef/SE, e.g. constant 17.181 (17.689)); stars legend not printed, text implies *** 1%, ** 5%, * 10%"
  },
  {
   "model_id": "T3-c2",
   "var_name_printed": "GARDENDUM",
   "taxonomy_id": "green_space",
   "x_transform": "dummy",
   "x_unit": "binary",
   "beta": 0.232,
   "se": null,
   "t": 2.377,
   "p": null,
   "p_stars": "**",
   "ci_lo": null,
   "ci_hi": null,
   "page": 7,
   "confidence": "high",
   "notes": "dummy for being close to a garden (coded 1/2 in Table 2, mean 1.79); values in parentheses are t-statistics (no legend printed; consistent with coef/SE, e.g. constant 17.181 (17.689)); stars legend not printed, text implies *** 1%, ** 5%, * 10%"
  },
  {
   "model_id": "T3-c2",
   "var_name_printed": "LnPM10",
   "taxonomy_id": "air_pollution",
   "x_transform": "log",
   "x_unit": "ppm",
   "beta": -0.32,
   "se": null,
   "t": -2.806,
   "p": null,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 7,
   "confidence": "medium",
   "notes": "PM10 concentration (printed unit 'ppm', mean 1,223.12), log; 2010 ambient monitoring data, kriged; values in parentheses are t-statistics (no legend printed; consistent with coef/SE, e.g. constant 17.181 (17.689)); stars legend not printed, text implies *** 1%, ** 5%, * 10%; Full-model LnPM10 elasticity -1.355 differs sharply from fit-model -0.320 and text quotes -0.32"
  }
 ]
}