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.

MeanAVBMSEMeanAVBMSEMeanAVBMSE

Count process
502.64040.04040.00252.63980.03980.00252.57110.02890.0018
2002.66990.06990.00532.61200.01200.00062.59580.00420.0005
5002.66760.06760.00502.61050.01050.00052.60660.00660.0005
50-0.57340.02660.0007-0.57500.02500.0006-0.59360.0064<0.0001
200-0.62000.02000.0004-0.58380.01620.0003-0.60570.0057<0.0001
500-0.59480.0052<0.0001-0.59920.0008<0.0001-0.60600.0060<0.0001
50-0.43820.03820.0016-0.36890.03110.0010-0.42130.02130.0005
200-0.42580.02580.0007-0.43790.03790.0014-0.38310.01690.0003
500-0.42340.02340.0006-0.38470.01530.0002-0.39080.00920.0001
NBP501.02650.02650.00075.59330.59330.3520150.71360.71360.5093
2001.07470.07470.01765.25900.25900.0672150.73400.73400.5389
5001.01800.01800.00045.00600.0060<0.0001150.77350.77350.5983
500.07340.02660.00070.07800.02200.00050.07520.02480.0006
2000.08680.01320.00030.07860.02140.00050.07950.02050.0004
5000.09810.00190.00010.09120.00880.00010.08930.01070.0002
Ordinal process
500.63460.03460.00170.6260.02600.00070.63780.03780.0014
2000.63180.03180.00120.62770.02770.00080.62160.02160.0005
5000.62140.02140.00050.62230.02230.00050.61950.01950.0004
500.15320.05320.00280.13180.03180.00100.12140.02140.0005
2000.13760.03760.00140.11560.01560.00020.11350.01350.0002
5000.12220.02220.00080.11580.01580.00050.11020.01020.0003
50-0.8960.10400.0111-0.88160.11840.0140-0.88040.11960.0143
200-0.80470.19530.0384-0.88620.11380.0130-0.89730.10270.0106
500-1.03180.03180.0010-0.93250.06750.0046-0.93110.06890.0047
501.06160.06160.00381.24760.24760.06131.14860.14860.0221
2001.19790.19790.03921.16290.16290.02651.11860.11860.0141
5000.91760.08240.00681.02010.02010.00041.01060.01060.0001
501.16290.13710.01881.16450.13550.01841.16390.13610.0185
2001.19240.10760.01161.19450.10550.01121.19150.10850.0118
5001.24230.05770.00331.27450.02550.00071.25250.04750.0023
500.05420.05420.00290.06660.06660.00450.03460.03460.0012
2000.00280.0028<0.00010.02570.02570.00070.01690.01690.0003
5000.00170.0017<0.00010.00230.0023<0.00010.00090.0009<0.0001

NBP: negative binomial parameter; AVB: the absolute value of biases; MSE: mean square error.