Table C8.
Choice Models with Alternative Distance Specifications
| Linear | Quadratic | Cubic | Quartic | Quintic | Log distance | |
|---|---|---|---|---|---|---|
| QOF 2006/7 points | 0.00231*** | 0.00221*** | 0.00222*** | 0.00222*** | 0.00222*** | 0.00216*** |
| (0.00016) | (0.00016) | (0.00016) | (0.00016) | (0.00016) | (0.00018) | |
| Distance km | −0.963*** | −1.424*** | −1.606*** | −1.430*** | −1.410*** | |
| (0.01189) | (0.01804) | (0.04044) | (0.07144) | (0.12245) | ||
| Distance squared | 0.0683*** | 0.126*** | 0.0318 | 0.0166 | ||
| (0.00226) | (0.01189) | (0.03442) | (0.08575) | |||
| Distance cubed | −0.00447*** | 0.0125* | 0.0171 | |||
| (0.00091) | (0.00607) | (0.02466) | ||||
| Distance power four | −0.000955** | −−0.00154 | ||||
| (0.00035) | (0.00303) | |||||
| Distance power five | 0.0000257 | |||||
| (0.00013) | ||||||
| Ln distance | −1.851*** | |||||
| (0.02036) | ||||||
| Distance | −0.9633*** | −0.8161*** | −0.7512*** | −0.7406*** | −0.7371*** | −0.4163*** |
| (0.0119) | (0.0092) | (0.0163) | (0.0170) | (0.0249) | (0.0046) | |
| MRS | 0.0024*** | 0.0027*** | 0.0030*** | 0.0030*** | 0.0030*** | 0.0052*** |
| (0.0002) | (0.0002) | (0.0002) | (0.0002) | (0.0002) | (0.0004) | |
| BIC | 11,779,955 | 11,603,666 | 11,597,725 | 11,596,060 | 11,596,070 | 12,246,338 |
| McFadden R2 | 0.3897 | 0.3988 | 0.3991 | 0.3992 | 0.3992 | 0.3655 |
Conditional logit models of choice of practice. All models have the same covariates as in Table 2. The distance coefficient is the derivative of the utility function evaluated using the estimated coefficients and the mean of the powers of LSOA to practice distance for the whole sample. Standard errors clustered at LSOA level are in parentheses. *p < 0.05, **p < 0.01, ***p < 0.001.