Table 3 Zero-inflated negative binomial model: robustness checks
From: The abolition of user charges and the demand for ambulatory visits: evidence from the Czech Republic
(1) | (2) | (3) | (4) | (5) | (6) |
|---|---|---|---|---|---|
Control group | Â | Adults aged 18 to 26 | Childless adults | Adults without the elderly | Employed adults up to 65 years |
| Â | Â | Number of obs = 494 | Number of obs = 1243 | Number of obs = 1471 | Number of obs = 1117 |
| Â | Â | Non-zero obs = 130 | Non-zero obs = 735 | Non-zero obs = 837 | Non-zero obs = 579 |
| Â | Â | Zero obs = 364 | Zero obs = 508 | Zero obs = 634 | Zero obs = 538 |
|  |  | LR χ 2(6) = 3.60 | LR χ 2(6) = 103.38 | LR χ 2(6) = 38.56 | LR χ 2(6) = 20.64 |
|  |  | Prob >χ 2 = 0.7301 | Prob >χ 2 = 0.0000 | Prob >χ 2 = 0.0000 | Prob >χ 2 = 0.0021 |
Count process | Â | Â | Â | Â | Â |
|  | reform | –0.249 | –0.015 | 0.034 | 0.109 |
|  | dummy_child | 0.172 | –0.023 | –0.072 | 0.133 |
|  | interaction | -0.659 | –0.246 | –0.583 | –0.851 |
|  | female | –0.116 | 0.144** | 0.368*** | 0.355*** |
|  | members | –0.029 | –0.265*** | –0.059* | 0.016 |
|  | log_income_memb | –0.158 | –0.461*** | –0.202*** | –0.003 |
| Â | _cons | 3.142 | 7.608*** | 3.675*** | 0.872 |
Logit | Â | Â | Â | Â | Â |
| Â | reform | 0.725 | 0.807*** | 1.617*** | 1.605*** |
| Â | dummy_child | 3.284*** | 3.415*** | 4.765*** | 5.042*** |
|  | interaction | –0.233 | –0.106 | –0.988 | –1.020 |
|  | female | –0.967*** | –0.881*** | –1.334*** | –1.462*** |
| Â | members | 0.414** | 0.660*** | 0.471*** | 0.333** |
| Â | log_income_memb | 0.299 | 0.246 | 0.115 | 0.122 |
|  | _cons | –5.532 | –5.895** | –4.809 | –4.567 |
|  | ln α | –0.443 | –0.757 | –0.219 | –0.242 |
|  | α | 0.642 | 0.469 | 0.804 | 0.785 |