1{2 "record_id": "1ce55be799df6cb17762fb0541fe95340687f3de",3 "eligible": true,4 "exclusion_reason": null,5 "study": {6 "title": "The willingness to pay for access to piped water: a hedonic analysis of house prices in Southwest Sri Lanka",7 "year": 2012,8 "doi": "10.1007/s12076-012-0079-y",9 "country": "Sri Lanka",10 "region_city": "Southwest Sri Lanka (Negombo, Kalutara, Galle districts)",11 "sample_start": 2003,12 "sample_end": 2004,13 "property_type": "single_family",14 "price_type": "appraisal",15 "data_source": "household survey 2003-04 (1,552 households); dependent variable is the owner-reported house appraisal value",16 "document_type": "journal",17 "estimators": [18 "OLS"19 ],20 "spatial_method": "none (district dummies)",21 "time_fe": false,22 "location_fe": true,23 "se_type": "unknown",24 "n_obs_total": 1523,25 "ai_methods": [],26 "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)."27 },28 "models": [29 {30 "model_id": "T2-c1",31 "table": "2",32 "column": "1",33 "page": 10,34 "dep_var": "ln of house appraisal value (LKR)",35 "dep_transform": "log",36 "estimator": "OLS",37 "n_obs": 1523,38 "r2": 0.41,39 "se_or_t_in_parentheses": "none",40 "sample_subset": "conventional hedonic model; SE and p value in separate columns; adj. R2"41 },42 {43 "model_id": "T3-c1",44 "table": "3",45 "column": "1",46 "page": 11,47 "dep_var": "ln of house appraisal value (LKR)",48 "dep_transform": "log",49 "estimator": "OLS",50 "n_obs": 1491,51 "r2": 0.45,52 "se_or_t_in_parentheses": "none",53 "sample_subset": "adjusted hedonic model with household socio-economic characteristics; SE and p value in separate columns; adj. R2"54 }55 ],56 "coefficients": [57 {58 "model_id": "T2-c1",59 "var_name_printed": "Number of rooms (ln)",60 "taxonomy_id": "bedrooms",61 "x_transform": "log",62 "x_unit": "count",63 "beta": 0.64,64 "se": 0.052,65 "t": null,66 "p": 0.0,67 "p_stars": "***",68 "ci_lo": null,69 "ci_hi": null,70 "page": 10,71 "confidence": "high",72 "notes": "number of rooms (log)"73 },74 {75 "model_id": "T3-c1",76 "var_name_printed": "Number of rooms (ln)",77 "taxonomy_id": "bedrooms",78 "x_transform": "log",79 "x_unit": "count",80 "beta": 0.556,81 "se": 0.052,82 "t": null,83 "p": 0.0,84 "p_stars": "***",85 "ci_lo": null,86 "ci_hi": null,87 "page": 11,88 "confidence": "high",89 "notes": "number of rooms (log)"90 },91 {92 "model_id": "T2-c1",93 "var_name_printed": "Number of toilets (0/1/2)",94 "taxonomy_id": "bathrooms",95 "x_transform": "level",96 "x_unit": "count (0 = none, 1 = one, 2 = two or more sealed toilets)",97 "beta": 0.467,98 "se": 0.052,99 "t": null,100 "p": 0.0,101 "p_stars": "***",102 "ci_lo": null,103 "ci_hi": null,104 "page": 10,105 "confidence": "high",106 "notes": ""107 },108 {109 "model_id": "T3-c1",110 "var_name_printed": "Number of toilets (0/1/2)",111 "taxonomy_id": "bathrooms",112 "x_transform": "level",113 "x_unit": "count (0 = none, 1 = one, 2 = two or more sealed toilets)",114 "beta": 0.334,115 "se": 0.052,116 "t": null,117 "p": 0.0,118 "p_stars": "***",119 "ci_lo": null,120 "ci_hi": null,121 "page": 11,122 "confidence": "high",123 "notes": ""124 },125 {126 "model_id": "T2-c1",127 "var_name_printed": "Wall is made of red bricks or cement (otherwise reference)",128 "taxonomy_id": "roof_materials",129 "x_transform": "binary",130 "x_unit": "binary",131 "beta": 0.929,132 "se": 0.113,133 "t": null,134 "p": 0.0,135 "p_stars": "***",136 "ci_lo": null,137 "ci_hi": null,138 "page": 10,139 "confidence": "high",140 "notes": "wall material"141 },142 {143 "model_id": "T3-c1",144 "var_name_printed": "Wall is made of red bricks or cement (otherwise reference)",145 "taxonomy_id": "roof_materials",146 "x_transform": "binary",147 "x_unit": "binary",148 "beta": 0.847,149 "se": 0.111,150 "t": null,151 "p": 0.0,152 "p_stars": "***",153 "ci_lo": null,154 "ci_hi": null,155 "page": 11,156 "confidence": "high",157 "notes": "wall material"158 },159 {160 "model_id": "T2-c1",161 "var_name_printed": "Roof is made of tiles (otherwise reference case)",162 "taxonomy_id": "roof_materials",163 "x_transform": "binary",164 "x_unit": "binary",165 "beta": 0.143,166 "se": 0.054,167 "t": null,168 "p": 0.008,169 "p_stars": "**",170 "ci_lo": null,171 "ci_hi": null,172 "page": 10,173 "confidence": "high",174 "notes": "roof material"175 },176 {177 "model_id": "T3-c1",178 "var_name_printed": "Roof is made of tiles (otherwise reference case)",179 "taxonomy_id": "roof_materials",180 "x_transform": "binary",181 "x_unit": "binary",182 "beta": 0.138,183 "se": 0.053,184 "t": null,185 "p": 0.009,186 "p_stars": "**",187 "ci_lo": null,188 "ci_hi": null,189 "page": 11,190 "confidence": "high",191 "notes": "roof material"192 },193 {194 "model_id": "T2-c1",195 "var_name_printed": "Overhead storage tank (not available reference case)",196 "taxonomy_id": "other",197 "x_transform": "binary",198 "x_unit": "binary (water storage tank)",199 "beta": 0.323,200 "se": 0.048,201 "t": null,202 "p": 0.0,203 "p_stars": "***",204 "ci_lo": null,205 "ci_hi": null,206 "page": 10,207 "confidence": "high",208 "notes": "water storage tank present"209 },210 {211 "model_id": "T3-c1",212 "var_name_printed": "Overhead storage tank (not available reference case)",213 "taxonomy_id": "other",214 "x_transform": "binary",215 "x_unit": "binary (water storage tank)",216 "beta": 0.219,217 "se": 0.048,218 "t": null,219 "p": 0.0,220 "p_stars": "***",221 "ci_lo": null,222 "ci_hi": null,223 "page": 11,224 "confidence": "high",225 "notes": "water storage tank present"226 },227 {228 "model_id": "T2-c1",229 "var_name_printed": "Mean household income by municipality (ln)",230 "taxonomy_id": "income",231 "x_transform": "log",232 "x_unit": "currency (LKR, mean household income by municipality), log",233 "beta": 0.355,234 "se": 0.112,235 "t": null,236 "p": 0.002,237 "p_stars": "***",238 "ci_lo": null,239 "ci_hi": null,240 "page": 10,241 "confidence": "high",242 "notes": ""243 },244 {245 "model_id": "T3-c1",246 "var_name_printed": "Mean household income by municipality (ln)",247 "taxonomy_id": "income",248 "x_transform": "log",249 "x_unit": "currency (LKR, mean household income by municipality), log",250 "beta": 0.31,251 "se": 0.109,252 "t": null,253 "p": 0.005,254 "p_stars": "***",255 "ci_lo": null,256 "ci_hi": null,257 "page": 11,258 "confidence": "high",259 "notes": ""260 },261 {262 "model_id": "T2-c1",263 "var_name_printed": "Percentage of Samurdhi recipients by municipality",264 "taxonomy_id": "other",265 "x_transform": "level",266 "x_unit": "share (proportion of welfare (Samurdhi) recipients in municipality)",267 "beta": -1.856,268 "se": 0.414,269 "t": null,270 "p": 0.0,271 "p_stars": "***",272 "ci_lo": null,273 "ci_hi": null,274 "page": 10,275 "confidence": "high",276 "notes": "neighbourhood poverty proxy"277 },278 {279 "model_id": "T3-c1",280 "var_name_printed": "Percentage of Samurdhi recipients by municipality",281 "taxonomy_id": "other",282 "x_transform": "level",283 "x_unit": "share (proportion of welfare (Samurdhi) recipients in municipality)",284 "beta": -1.553,285 "se": 0.406,286 "t": null,287 "p": 0.0,288 "p_stars": "***",289 "ci_lo": null,290 "ci_hi": null,291 "page": 11,292 "confidence": "high",293 "notes": "neighbourhood poverty proxy"294 },295 {296 "model_id": "T2-c1",297 "var_name_printed": "Distance to road in km (ln)",298 "taxonomy_id": "highway_distance",299 "x_transform": "log",300 "x_unit": "km",301 "beta": -0.071,302 "se": 0.022,303 "t": null,304 "p": 0.001,305 "p_stars": "***",306 "ci_lo": null,307 "ci_hi": null,308 "page": 10,309 "confidence": "high",310 "notes": "distance to paved road"311 },312 {313 "model_id": "T3-c1",314 "var_name_printed": "Distance to road in km (ln)",315 "taxonomy_id": "highway_distance",316 "x_transform": "log",317 "x_unit": "km",318 "beta": -0.071,319 "se": 0.021,320 "t": null,321 "p": 0.0,322 "p_stars": "***",323 "ci_lo": null,324 "ci_hi": null,325 "page": 11,326 "confidence": "high",327 "notes": "distance to paved road"328 },329 {330 "model_id": "T2-c1",331 "var_name_printed": "Household has access to private piped water connection (0/1)",332 "taxonomy_id": "other",333 "x_transform": "binary",334 "x_unit": "binary",335 "beta": 0.195,336 "se": 0.048,337 "t": null,338 "p": 0.0,339 "p_stars": "***",340 "ci_lo": null,341 "ci_hi": null,342 "page": 10,343 "confidence": "high",344 "notes": "key variable: private piped water connection (reference: non-piped sources only)"345 },346 {347 "model_id": "T3-c1",348 "var_name_printed": "Household has access to private piped water connection (0/1)",349 "taxonomy_id": "other",350 "x_transform": "binary",351 "x_unit": "binary",352 "beta": 0.152,353 "se": 0.047,354 "t": null,355 "p": 0.001,356 "p_stars": "***",357 "ci_lo": null,358 "ci_hi": null,359 "page": 11,360 "confidence": "high",361 "notes": "key variable: private piped water connection (reference: non-piped sources only)"362 }363 ]364}