{
 "record_id": "03bfeba917085bc65a0ab641e5a03916b687b20f",
 "eligible": true,
 "exclusion_reason": null,
 "study": {
  "title": "Economic feasibility of wood-based structures—Improving urban carbon neutrality strategies",
  "year": 2021,
  "doi": "10.1088/2634-4505/abfe05",
  "country": "Finland",
  "region_city": "Helsinki metropolitan area (Helsinki, Espoo, Vantaa)",
  "sample_start": 1999,
  "sample_end": 2018,
  "property_type": "condo_apartment",
  "price_type": "transaction",
  "data_source": "Central Federation of Finnish Real Estate Agencies (KVKL) transaction data 1999-2018, apartment-building dwellings built 1990-2020; Statistics Finland 250 m grid neighbourhood data",
  "document_type": "journal",
  "estimators": [
   "OLS"
  ],
  "spatial_method": "none (postal-code dummies)",
  "time_fe": false,
  "location_fe": true,
  "se_type": "clustered",
  "n_obs_total": 27954,
  "ai_methods": [],
  "notes": "Environmental Research: Infrastructure and Sustainability 1 (2021) 011002. Only the wood coefficient is reported numerically; the other hedonic controls (log size, log age, rooms, condition, new development, elevator, lot ownership, log distance to CBD, sold >= 2011 dummy, neighbourhood variables) are included via stepwise selection but their coefficients are not printed (Table 3 only flags significance). Dependent variable stated as ln(price of dwelling); Table 1 summarises price per m2 but equation (1) uses dwelling price. 'Sold during or after 2011' dummy is the only time control (time_fe set false). SE clustered by postal codes."
 },
 "models": [
  {
   "model_id": "T2-c1",
   "table": "2",
   "column": "1 (HMA)",
   "page": 7,
   "dep_var": "ln(transaction price of dwelling)",
   "dep_transform": "log",
   "estimator": "OLS",
   "n_obs": 27954,
   "r2": 0.907,
   "se_or_t_in_parentheses": "se",
   "sample_subset": "Helsinki metropolitan area (Helsinki+Espoo+Vantaa), 137 postal-code dummies; housing, neighbourhood characteristics and distance to CBD included; apartment-building dwellings built 1990-2020, sold 1999-2018; stepwise OLS, SE clustered by postal code; only the wood coefficient is printed"
  },
  {
   "model_id": "T2-c2",
   "table": "2",
   "column": "2 (Helsinki)",
   "page": 7,
   "dep_var": "ln(transaction price of dwelling)",
   "dep_transform": "log",
   "estimator": "OLS",
   "n_obs": 14867,
   "r2": 0.91,
   "se_or_t_in_parentheses": "se",
   "sample_subset": "City of Helsinki, 79 postal codes; full controls; apartment-building dwellings built 1990-2020, sold 1999-2018; stepwise OLS, SE clustered by postal code; only the wood coefficient is printed"
  },
  {
   "model_id": "T2-c3",
   "table": "2",
   "column": "3 (Espoo)",
   "page": 7,
   "dep_var": "ln(transaction price of dwelling)",
   "dep_transform": "log",
   "estimator": "OLS",
   "n_obs": 7422,
   "r2": 0.891,
   "se_or_t_in_parentheses": "se",
   "sample_subset": "City of Espoo, 33 postal codes; full controls; apartment-building dwellings built 1990-2020, sold 1999-2018; stepwise OLS, SE clustered by postal code; only the wood coefficient is printed"
  },
  {
   "model_id": "T2-c4",
   "table": "2",
   "column": "4 (Vantaa)",
   "page": 7,
   "dep_var": "ln(transaction price of dwelling)",
   "dep_transform": "log",
   "estimator": "OLS",
   "n_obs": 5665,
   "r2": 0.876,
   "se_or_t_in_parentheses": "se",
   "sample_subset": "City of Vantaa, 25 postal codes; distance to CBD excluded (multicollinearity); apartment-building dwellings built 1990-2020, sold 1999-2018; stepwise OLS, SE clustered by postal code; only the wood coefficient is printed"
  },
  {
   "model_id": "T4-c1",
   "table": "4",
   "column": "1 (Helsinki)",
   "page": 8,
   "dep_var": "ln(transaction price of dwelling)",
   "dep_transform": "log",
   "estimator": "OLS",
   "n_obs": 14888,
   "r2": 0.003,
   "se_or_t_in_parentheses": "se",
   "sample_subset": "Helsinki only, gradually adding variable groups: wood only; SE clustered by 79 postal codes"
  },
  {
   "model_id": "T4-c2",
   "table": "4",
   "column": "2 (Helsinki)",
   "page": 8,
   "dep_var": "ln(transaction price of dwelling)",
   "dep_transform": "log",
   "estimator": "OLS",
   "n_obs": 14888,
   "r2": 0.574,
   "se_or_t_in_parentheses": "se",
   "sample_subset": "Helsinki only, gradually adding variable groups: wood + age & size; SE clustered by 79 postal codes"
  },
  {
   "model_id": "T4-c3",
   "table": "4",
   "column": "3 (Helsinki)",
   "page": 8,
   "dep_var": "ln(transaction price of dwelling)",
   "dep_transform": "log",
   "estimator": "OLS",
   "n_obs": 14888,
   "r2": 0.85,
   "se_or_t_in_parentheses": "se",
   "sample_subset": "Helsinki only, gradually adding variable groups: + housing characteristics + CBD Euclidean distance; SE clustered by 79 postal codes"
  },
  {
   "model_id": "T4-c4",
   "table": "4",
   "column": "4 (Helsinki)",
   "page": 8,
   "dep_var": "ln(transaction price of dwelling)",
   "dep_transform": "log",
   "estimator": "OLS",
   "n_obs": 14867,
   "r2": 0.894,
   "se_or_t_in_parentheses": "se",
   "sample_subset": "Helsinki only, gradually adding variable groups: + neighbourhood characteristics; SE clustered by 79 postal codes"
  },
  {
   "model_id": "T4-c5",
   "table": "4",
   "column": "5 (Helsinki)",
   "page": 8,
   "dep_var": "ln(transaction price of dwelling)",
   "dep_transform": "log",
   "estimator": "OLS",
   "n_obs": 14867,
   "r2": 0.91,
   "se_or_t_in_parentheses": "se",
   "sample_subset": "Helsinki only, gradually adding variable groups: + postal codes [79]; identical to Table 2 col 2; SE clustered by 79 postal codes"
  }
 ],
 "coefficients": [
  {
   "model_id": "T2-c1",
   "var_name_printed": "Effect of wood",
   "taxonomy_id": "roof_materials",
   "x_transform": "dummy",
   "x_unit": "binary",
   "beta": 0.017,
   "se": 0.025,
   "t": null,
   "p": 0.498,
   "p_stars": "",
   "ci_lo": null,
   "ci_hi": null,
   "page": 7,
   "confidence": "high",
   "notes": "wooden structure dummy (fully wooden or wooden-frame building); Std. err. printed in [brackets]; p-value from text (p.6-8); stars *p<0.05 **p<0.01 ***p<0.001; other hedonic coefficients not printed (Table 3 lists only which were significant)"
  },
  {
   "model_id": "T2-c2",
   "var_name_printed": "Effect of wood",
   "taxonomy_id": "roof_materials",
   "x_transform": "dummy",
   "x_unit": "binary",
   "beta": 0.085,
   "se": 0.02,
   "t": null,
   "p": 0.0,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 7,
   "confidence": "high",
   "notes": "wooden structure dummy (fully wooden or wooden-frame building); Std. err. printed in [brackets]; p-value from text (p.6-8); stars *p<0.05 **p<0.01 ***p<0.001; other hedonic coefficients not printed (Table 3 lists only which were significant)"
  },
  {
   "model_id": "T2-c3",
   "var_name_printed": "Effect of wood",
   "taxonomy_id": "roof_materials",
   "x_transform": "dummy",
   "x_unit": "binary",
   "beta": 0.029,
   "se": 0.037,
   "t": null,
   "p": 0.443,
   "p_stars": "",
   "ci_lo": null,
   "ci_hi": null,
   "page": 7,
   "confidence": "high",
   "notes": "wooden structure dummy (fully wooden or wooden-frame building); Std. err. printed in [brackets]; p-value from text (p.6-8); stars *p<0.05 **p<0.01 ***p<0.001; other hedonic coefficients not printed (Table 3 lists only which were significant)"
  },
  {
   "model_id": "T2-c4",
   "var_name_printed": "Effect of wood",
   "taxonomy_id": "roof_materials",
   "x_transform": "dummy",
   "x_unit": "binary",
   "beta": -0.011,
   "se": 0.022,
   "t": null,
   "p": 0.613,
   "p_stars": "",
   "ci_lo": null,
   "ci_hi": null,
   "page": 7,
   "confidence": "high",
   "notes": "wooden structure dummy (fully wooden or wooden-frame building); Std. err. printed in [brackets]; p-value from text (p.6-8); stars *p<0.05 **p<0.01 ***p<0.001; other hedonic coefficients not printed (Table 3 lists only which were significant)"
  },
  {
   "model_id": "T4-c1",
   "var_name_printed": "Wood",
   "taxonomy_id": "roof_materials",
   "x_transform": "dummy",
   "x_unit": "binary",
   "beta": -0.259,
   "se": 0.079,
   "t": null,
   "p": null,
   "p_stars": "**",
   "ci_lo": null,
   "ci_hi": null,
   "page": 8,
   "confidence": "high",
   "notes": "wooden structure dummy; printed with decimal commas (e.g. '−0, 259', '[0, 079]'); stars *p<0.05 **p<0.01 ***p<0.001 (Table 2 legend); specification: wood only"
  },
  {
   "model_id": "T4-c2",
   "var_name_printed": "Wood",
   "taxonomy_id": "roof_materials",
   "x_transform": "dummy",
   "x_unit": "binary",
   "beta": -0.167,
   "se": 0.07,
   "t": null,
   "p": null,
   "p_stars": "*",
   "ci_lo": null,
   "ci_hi": null,
   "page": 8,
   "confidence": "high",
   "notes": "wooden structure dummy; printed with decimal commas (e.g. '−0, 259', '[0, 079]'); stars *p<0.05 **p<0.01 ***p<0.001 (Table 2 legend); specification: wood + age & size"
  },
  {
   "model_id": "T4-c3",
   "var_name_printed": "Wood",
   "taxonomy_id": "roof_materials",
   "x_transform": "dummy",
   "x_unit": "binary",
   "beta": 0.043,
   "se": 0.024,
   "t": null,
   "p": null,
   "p_stars": "",
   "ci_lo": null,
   "ci_hi": null,
   "page": 8,
   "confidence": "high",
   "notes": "wooden structure dummy; printed with decimal commas (e.g. '−0, 259', '[0, 079]'); stars *p<0.05 **p<0.01 ***p<0.001 (Table 2 legend); specification: + housing characteristics + CBD Euclidean distance"
  },
  {
   "model_id": "T4-c4",
   "var_name_printed": "Wood",
   "taxonomy_id": "roof_materials",
   "x_transform": "dummy",
   "x_unit": "binary",
   "beta": 0.041,
   "se": 0.02,
   "t": null,
   "p": null,
   "p_stars": "*",
   "ci_lo": null,
   "ci_hi": null,
   "page": 8,
   "confidence": "high",
   "notes": "wooden structure dummy; printed with decimal commas (e.g. '−0, 259', '[0, 079]'); stars *p<0.05 **p<0.01 ***p<0.001 (Table 2 legend); specification: + neighbourhood characteristics"
  },
  {
   "model_id": "T4-c5",
   "var_name_printed": "Wood",
   "taxonomy_id": "roof_materials",
   "x_transform": "dummy",
   "x_unit": "binary",
   "beta": 0.085,
   "se": 0.02,
   "t": null,
   "p": null,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 8,
   "confidence": "high",
   "notes": "wooden structure dummy; printed with decimal commas (e.g. '−0, 259', '[0, 079]'); stars *p<0.05 **p<0.01 ***p<0.001 (Table 2 legend); specification: + postal codes [79]; identical to Table 2 col 2"
  }
 ]
}