{
 "record_id": "1ce55be799df6cb17762fb0541fe95340687f3de",
 "eligible": true,
 "exclusion_reason": null,
 "study": {
  "title": "The willingness to pay for access to piped water: a hedonic analysis of house prices in Southwest Sri Lanka",
  "year": 2012,
  "doi": "10.1007/s12076-012-0079-y",
  "country": "Sri Lanka",
  "region_city": "Southwest Sri Lanka (Negombo, Kalutara, Galle districts)",
  "sample_start": 2003,
  "sample_end": 2004,
  "property_type": "single_family",
  "price_type": "appraisal",
  "data_source": "household survey 2003-04 (1,552 households); dependent variable is the owner-reported house appraisal value",
  "document_type": "journal",
  "estimators": [
   "OLS"
  ],
  "spatial_method": "none (district dummies)",
  "time_fe": false,
  "location_fe": true,
  "se_type": "unknown",
  "n_obs_total": 1523,
  "ai_methods": [],
  "notes": "Dependent variable: ln of house appraisal value (LKR) from household survey. Table 2 = conventional hedonic model (n=1,523); Table 3 = adjusted model adding household socio-economic characteristics (n=1,491). Standard errors and p-values in separate columns; star legend *** 1%, ** 5%, * 10% (the roof-tiles coefficient carries ** with p=0.008 as printed). District dummies (Kalutara, Galle; Negombo reference) and household socio-economic variables (household income, Samurdhi recipient, education of head: occupant characteristics) not extracted. Property type assumed single-family houses (survey of households' dwellings)."
 },
 "models": [
  {
   "model_id": "T2-c1",
   "table": "2",
   "column": "1",
   "page": 10,
   "dep_var": "ln of house appraisal value (LKR)",
   "dep_transform": "log",
   "estimator": "OLS",
   "n_obs": 1523,
   "r2": 0.41,
   "se_or_t_in_parentheses": "none",
   "sample_subset": "conventional hedonic model; SE and p value in separate columns; adj. R2"
  },
  {
   "model_id": "T3-c1",
   "table": "3",
   "column": "1",
   "page": 11,
   "dep_var": "ln of house appraisal value (LKR)",
   "dep_transform": "log",
   "estimator": "OLS",
   "n_obs": 1491,
   "r2": 0.45,
   "se_or_t_in_parentheses": "none",
   "sample_subset": "adjusted hedonic model with household socio-economic characteristics; SE and p value in separate columns; adj. R2"
  }
 ],
 "coefficients": [
  {
   "model_id": "T2-c1",
   "var_name_printed": "Number of rooms (ln)",
   "taxonomy_id": "bedrooms",
   "x_transform": "log",
   "x_unit": "count",
   "beta": 0.64,
   "se": 0.052,
   "t": null,
   "p": 0.0,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 10,
   "confidence": "high",
   "notes": "number of rooms (log)"
  },
  {
   "model_id": "T3-c1",
   "var_name_printed": "Number of rooms (ln)",
   "taxonomy_id": "bedrooms",
   "x_transform": "log",
   "x_unit": "count",
   "beta": 0.556,
   "se": 0.052,
   "t": null,
   "p": 0.0,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 11,
   "confidence": "high",
   "notes": "number of rooms (log)"
  },
  {
   "model_id": "T2-c1",
   "var_name_printed": "Number of toilets (0/1/2)",
   "taxonomy_id": "bathrooms",
   "x_transform": "level",
   "x_unit": "count (0 = none, 1 = one, 2 = two or more sealed toilets)",
   "beta": 0.467,
   "se": 0.052,
   "t": null,
   "p": 0.0,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 10,
   "confidence": "high",
   "notes": ""
  },
  {
   "model_id": "T3-c1",
   "var_name_printed": "Number of toilets (0/1/2)",
   "taxonomy_id": "bathrooms",
   "x_transform": "level",
   "x_unit": "count (0 = none, 1 = one, 2 = two or more sealed toilets)",
   "beta": 0.334,
   "se": 0.052,
   "t": null,
   "p": 0.0,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 11,
   "confidence": "high",
   "notes": ""
  },
  {
   "model_id": "T2-c1",
   "var_name_printed": "Wall is made of red bricks or cement (otherwise reference)",
   "taxonomy_id": "roof_materials",
   "x_transform": "binary",
   "x_unit": "binary",
   "beta": 0.929,
   "se": 0.113,
   "t": null,
   "p": 0.0,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 10,
   "confidence": "high",
   "notes": "wall material"
  },
  {
   "model_id": "T3-c1",
   "var_name_printed": "Wall is made of red bricks or cement (otherwise reference)",
   "taxonomy_id": "roof_materials",
   "x_transform": "binary",
   "x_unit": "binary",
   "beta": 0.847,
   "se": 0.111,
   "t": null,
   "p": 0.0,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 11,
   "confidence": "high",
   "notes": "wall material"
  },
  {
   "model_id": "T2-c1",
   "var_name_printed": "Roof is made of tiles (otherwise reference case)",
   "taxonomy_id": "roof_materials",
   "x_transform": "binary",
   "x_unit": "binary",
   "beta": 0.143,
   "se": 0.054,
   "t": null,
   "p": 0.008,
   "p_stars": "**",
   "ci_lo": null,
   "ci_hi": null,
   "page": 10,
   "confidence": "high",
   "notes": "roof material"
  },
  {
   "model_id": "T3-c1",
   "var_name_printed": "Roof is made of tiles (otherwise reference case)",
   "taxonomy_id": "roof_materials",
   "x_transform": "binary",
   "x_unit": "binary",
   "beta": 0.138,
   "se": 0.053,
   "t": null,
   "p": 0.009,
   "p_stars": "**",
   "ci_lo": null,
   "ci_hi": null,
   "page": 11,
   "confidence": "high",
   "notes": "roof material"
  },
  {
   "model_id": "T2-c1",
   "var_name_printed": "Overhead storage tank (not available reference case)",
   "taxonomy_id": "other",
   "x_transform": "binary",
   "x_unit": "binary (water storage tank)",
   "beta": 0.323,
   "se": 0.048,
   "t": null,
   "p": 0.0,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 10,
   "confidence": "high",
   "notes": "water storage tank present"
  },
  {
   "model_id": "T3-c1",
   "var_name_printed": "Overhead storage tank (not available reference case)",
   "taxonomy_id": "other",
   "x_transform": "binary",
   "x_unit": "binary (water storage tank)",
   "beta": 0.219,
   "se": 0.048,
   "t": null,
   "p": 0.0,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 11,
   "confidence": "high",
   "notes": "water storage tank present"
  },
  {
   "model_id": "T2-c1",
   "var_name_printed": "Mean household income by municipality (ln)",
   "taxonomy_id": "income",
   "x_transform": "log",
   "x_unit": "currency (LKR, mean household income by municipality), log",
   "beta": 0.355,
   "se": 0.112,
   "t": null,
   "p": 0.002,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 10,
   "confidence": "high",
   "notes": ""
  },
  {
   "model_id": "T3-c1",
   "var_name_printed": "Mean household income by municipality (ln)",
   "taxonomy_id": "income",
   "x_transform": "log",
   "x_unit": "currency (LKR, mean household income by municipality), log",
   "beta": 0.31,
   "se": 0.109,
   "t": null,
   "p": 0.005,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 11,
   "confidence": "high",
   "notes": ""
  },
  {
   "model_id": "T2-c1",
   "var_name_printed": "Percentage of Samurdhi recipients by municipality",
   "taxonomy_id": "other",
   "x_transform": "level",
   "x_unit": "share (proportion of welfare (Samurdhi) recipients in municipality)",
   "beta": -1.856,
   "se": 0.414,
   "t": null,
   "p": 0.0,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 10,
   "confidence": "high",
   "notes": "neighbourhood poverty proxy"
  },
  {
   "model_id": "T3-c1",
   "var_name_printed": "Percentage of Samurdhi recipients by municipality",
   "taxonomy_id": "other",
   "x_transform": "level",
   "x_unit": "share (proportion of welfare (Samurdhi) recipients in municipality)",
   "beta": -1.553,
   "se": 0.406,
   "t": null,
   "p": 0.0,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 11,
   "confidence": "high",
   "notes": "neighbourhood poverty proxy"
  },
  {
   "model_id": "T2-c1",
   "var_name_printed": "Distance to road in km (ln)",
   "taxonomy_id": "highway_distance",
   "x_transform": "log",
   "x_unit": "km",
   "beta": -0.071,
   "se": 0.022,
   "t": null,
   "p": 0.001,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 10,
   "confidence": "high",
   "notes": "distance to paved road"
  },
  {
   "model_id": "T3-c1",
   "var_name_printed": "Distance to road in km (ln)",
   "taxonomy_id": "highway_distance",
   "x_transform": "log",
   "x_unit": "km",
   "beta": -0.071,
   "se": 0.021,
   "t": null,
   "p": 0.0,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 11,
   "confidence": "high",
   "notes": "distance to paved road"
  },
  {
   "model_id": "T2-c1",
   "var_name_printed": "Household has access to private piped water connection (0/1)",
   "taxonomy_id": "other",
   "x_transform": "binary",
   "x_unit": "binary",
   "beta": 0.195,
   "se": 0.048,
   "t": null,
   "p": 0.0,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 10,
   "confidence": "high",
   "notes": "key variable: private piped water connection (reference: non-piped sources only)"
  },
  {
   "model_id": "T3-c1",
   "var_name_printed": "Household has access to private piped water connection (0/1)",
   "taxonomy_id": "other",
   "x_transform": "binary",
   "x_unit": "binary",
   "beta": 0.152,
   "se": 0.047,
   "t": null,
   "p": 0.001,
   "p_stars": "***",
   "ci_lo": null,
   "ci_hi": null,
   "page": 11,
   "confidence": "high",
   "notes": "key variable: private piped water connection (reference: non-piped sources only)"
  }
 ]
}