Research Article
Longitudinal Joint Modelling of Ordinal and Overdispersed Count Outcomes: A Bridge Distribution for the Ordinal Random Intercept
Table 3
Simulation study results with zero correlation between the random intercepts and normal distribution for the random intercept of the ordinal outcome.
| | | | | Mean | AVB | MSE | Mean | AVB | MSE | Mean | AVB | MSE |
| Count process | | | | | | | | | | | | 50 | 2.6404 | 0.0404 | 0.0025 | 2.6398 | 0.0398 | 0.0025 | 2.5711 | 0.0289 | 0.0018 | 200 | 2.6699 | 0.0699 | 0.0053 | 2.6120 | 0.0120 | 0.0006 | 2.5958 | 0.0042 | 0.0005 | 500 | 2.6676 | 0.0676 | 0.0050 | 2.6105 | 0.0105 | 0.0005 | 2.6066 | 0.0066 | 0.0005 | | 50 | -0.5734 | 0.0266 | 0.0007 | -0.5750 | 0.0250 | 0.0006 | -0.5936 | 0.0064 | <0.0001 | 200 | -0.6200 | 0.0200 | 0.0004 | -0.5838 | 0.0162 | 0.0003 | -0.6057 | 0.0057 | <0.0001 | 500 | -0.5948 | 0.0052 | <0.0001 | -0.5992 | 0.0008 | <0.0001 | -0.6060 | 0.0060 | <0.0001 | | 50 | -0.4382 | 0.0382 | 0.0016 | -0.3689 | 0.0311 | 0.0010 | -0.4213 | 0.0213 | 0.0005 | 200 | -0.4258 | 0.0258 | 0.0007 | -0.4379 | 0.0379 | 0.0014 | -0.3831 | 0.0169 | 0.0003 | 500 | -0.4234 | 0.0234 | 0.0006 | -0.3847 | 0.0153 | 0.0002 | -0.3908 | 0.0092 | 0.0001 | NBP | 50 | 1.0265 | 0.0265 | 0.0007 | 5.5933 | 0.5933 | 0.3520 | 150.7136 | 0.7136 | 0.5093 | 200 | 1.0747 | 0.0747 | 0.0176 | 5.2590 | 0.2590 | 0.0672 | 150.7340 | 0.7340 | 0.5389 | 500 | 1.0180 | 0.0180 | 0.0004 | 5.0060 | 0.0060 | <0.0001 | 150.7735 | 0.7735 | 0.5983 | | 50 | 0.0734 | 0.0266 | 0.0007 | 0.0780 | 0.0220 | 0.0005 | 0.0752 | 0.0248 | 0.0006 | 200 | 0.0868 | 0.0132 | 0.0003 | 0.0786 | 0.0214 | 0.0005 | 0.0795 | 0.0205 | 0.0004 | 500 | 0.0981 | 0.0019 | 0.0001 | 0.0912 | 0.0088 | 0.0001 | 0.0893 | 0.0107 | 0.0002 | Ordinal process | | | | | | | | | | | | 50 | 0.6346 | 0.0346 | 0.0017 | 0.626 | 0.0260 | 0.0007 | 0.6378 | 0.0378 | 0.0014 | 200 | 0.6318 | 0.0318 | 0.0012 | 0.6277 | 0.0277 | 0.0008 | 0.6216 | 0.0216 | 0.0005 | 500 | 0.6214 | 0.0214 | 0.0005 | 0.6223 | 0.0223 | 0.0005 | 0.6195 | 0.0195 | 0.0004 | | 50 | 0.1532 | 0.0532 | 0.0028 | 0.1318 | 0.0318 | 0.0010 | 0.1214 | 0.0214 | 0.0005 | 200 | 0.1376 | 0.0376 | 0.0014 | 0.1156 | 0.0156 | 0.0002 | 0.1135 | 0.0135 | 0.0002 | 500 | 0.1222 | 0.0222 | 0.0008 | 0.1158 | 0.0158 | 0.0005 | 0.1102 | 0.0102 | 0.0003 | | 50 | -0.896 | 0.1040 | 0.0111 | -0.8816 | 0.1184 | 0.0140 | -0.8804 | 0.1196 | 0.0143 | 200 | -0.8047 | 0.1953 | 0.0384 | -0.8862 | 0.1138 | 0.0130 | -0.8973 | 0.1027 | 0.0106 | 500 | -1.0318 | 0.0318 | 0.0010 | -0.9325 | 0.0675 | 0.0046 | -0.9311 | 0.0689 | 0.0047 | | 50 | 1.0616 | 0.0616 | 0.0038 | 1.2476 | 0.2476 | 0.0613 | 1.1486 | 0.1486 | 0.0221 | 200 | 1.1979 | 0.1979 | 0.0392 | 1.1629 | 0.1629 | 0.0265 | 1.1186 | 0.1186 | 0.0141 | 500 | 0.9176 | 0.0824 | 0.0068 | 1.0201 | 0.0201 | 0.0004 | 1.0106 | 0.0106 | 0.0001 | | 50 | 1.1629 | 0.1371 | 0.0188 | 1.1645 | 0.1355 | 0.0184 | 1.1639 | 0.1361 | 0.0185 | 200 | 1.1924 | 0.1076 | 0.0116 | 1.1945 | 0.1055 | 0.0112 | 1.1915 | 0.1085 | 0.0118 | 500 | 1.2423 | 0.0577 | 0.0033 | 1.2745 | 0.0255 | 0.0007 | 1.2525 | 0.0475 | 0.0023 | | 50 | 0.0542 | 0.0542 | 0.0029 | 0.0666 | 0.0666 | 0.0045 | 0.0346 | 0.0346 | 0.0012 | 200 | 0.0028 | 0.0028 | <0.0001 | 0.0257 | 0.0257 | 0.0007 | 0.0169 | 0.0169 | 0.0003 | 500 | 0.0017 | 0.0017 | <0.0001 | 0.0023 | 0.0023 | <0.0001 | 0.0009 | 0.0009 | <0.0001 |
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NBP: negative binomial parameter; AVB: the absolute value of biases; MSE: mean square error.
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