Table 6 Estimates of parameters, standard errors (s.e.) and P values in the bivariate selection model using two-step and one-step methods
Reason | Parameter | Two-step | One-step | ||||
|---|---|---|---|---|---|---|---|
Estimate | s.e. | P value | Estimate | s.e. | P value | ||
Noncontact | Intercept | 1.605 | 0.127 | 0.000 | 1.604 | 0.127 | 0.000 |
|  | Org. 1 | − 0.971 | 0.297 | 0.000 | − 0.970 | 0.297 | 0.001 |
|  | Org. 7 | − 1.019 | 0.199 | 0.000 | − 1.012 | 0.199 | 0.000 |
|  | Org. 11 | − 1.892 | 0.504 | 0.000 | − 1.943 | 0.509 | 0.000 |
|  | Previous status in survey | − 0.378 | 0.186 | 0.042 | − 0.377 | 0.185 | 0.041 |
| Â | Not having ancillary unit | 0.379 | 0.176 | 0.031 | 0.378 | 0.179 | 0.035 |
| Â | Position in industrial zone | 0.356 | 0.140 | 0.011 | 0.358 | 0.141 | 0.011 |
Refusal | Intercept | 1.155 | 0.082 | 0.000 | 1.184 | 0.080 | 0.000 |
| Â | Org. 3 | 0.343 | 0.207 | 0.096 | 0.471 | 0.208 | 0.023 |
| Â | Org. 10 | 0.285 | 0.162 | 0.079 | 0.153 | 0.166 | 0.358 |
| Â | Org. 12 | 0.694 | 0.289 | 0.016 | 0.675 | 0.284 | 0.018 |
|  | Org. 20 | − 1.083 | 0.186 | 0.000 | − 1.076 | 0.181 | 0.000 |
|  | Org. 23 | − 0.615 | 0.112 | 0.000 | − 0.681 | 0.110 | 0.000 |
|  | Org. 25 | − 1.072 | 0.201 | 0.000 | − 1.059 | 0.195 | 0.000 |
|  | Previous status in survey | − 1.076 | 0.152 | 0.000 | − 1.024 | 0.162 | 0.000 |
|  | Previous status in sample | − 0.595 | 0.093 | 0.000 | − 0.567 | 0.093 | 0.000 |
| Â | Not having ancillary unit | 0.240 | 0.099 | 0.015 | 0.146 | 0.102 | 0.151 |
Correlation between noncontact and refusal | − 0.440 | 0.535 | 0.411 | − 0.657 | 0.785 | 0.402 | |