Table 1.
MLwiN results for the mastitis incidence survival model run for 50000 iterations†
| Parameter |
Results for the non-centred model |
Results for the hierarchically centred model |
||
|---|---|---|---|---|
| Estimate‡ | ESS | Estimate‡ | ESS | |
| α0—intercept | −2.650 (0.424) | 32 | −2.743 (0.400) | 2695 |
| α1—logt | −0.631 (0.033) | 875 | −0.632 (0.034) | 926 |
| α2—logt2 | −0.462 (0.040) | 98 | −0.468 (0.043) | 75 |
| α3—logt3 | −0.178 (0.013) | 99 | −0.181 (0.014) | 75 |
| β1—parity 1 | −0.839 (0.124) | 1095 | −0.839 (0.126) | 1058 |
| β2—parity 2 | −0.407 (0.055) | 3747 | −0.405 (0.054) | 2087 |
| β3—parity 3 | −0.319 (0.055) | 4759 | −0.318 (0.055) | 3275 |
| β4—parity 4 | −0.196 (0.056) | 5165 | −0.195 (0.056) | 4271 |
| β5—scchigh | 0.329 (0.044) | 2765 | 0.332 (0.044) | 1438 |
| β6—scc>2 | 0.030 (0.097) | 1386 | 0.033 (0.097) | 1248 |
| β7—dostand | −0.356 (0.103) | 291 | −0.342 (0.102) | 3187 |
| β8—edpdisinfect | −0.279 (0.136) | 703 | −0.274 (0.145) | 3554 |
| β9—edpdisinfectna | 0.163 (0.291) | 43 | 0.155 (0.288) | 5359 |
| β10—transcow | −1.067 (0.326) | 44 | −1.022 (0.308) | 3448 |
| β11—transcowna | −1.382 (0.372) | 34 | −1.291 (0.362) | 2674 |
| β12—transdis | −0.650 (0.248) | 118 | −0.613 (0.249) | 2268 |
| β13—scrape1 | −0.843 (0.292) | 57 | −0.793 (0.288) | 2524 |
| β14—scrape2 | −0.885 (0.399) | 288 | −0.839 (0.393) | 1945 |
| β15—nofeedandloaf | −0.083 (0.296) | 50 | −0.101 (0.294) | 5183 |
 |
0.039 (0.019) | 630 | 0.041 (0.020) | 764 |
 |
0.025 (0.024) | 1555 | 0.026 (0.024) | 1566 |
 |
0.158 (0.065) | 2439 | 0.154 (0.064) | 2275 |
 |
0.066 (0.022) | 796 | 0.065 (0.022) | 1052 |
†
ESS values in italics are fixed effects associated with higher level predictors and hence are directly affected by centring.
‡
Standard deviations are given in parentheses.