Research Article

Longitudinal Joint Modelling of Ordinal and Overdispersed Count Outcomes: A Bridge Distribution for the Ordinal Random Intercept

Table 4

Simulation study results with zero correlation between the random intercepts and Bridge distribution for the random intercept of the ordinal outcome.

MeanAVBMSEMeanAVBMSEMeanAVBMSE

Count process
502.76890.16890.02952.62920.02920.00182.57840.02160.0014
2002.64640.04640.00262.61140.01140.00062.61200.01200.0006
5002.62420.02420.00102.61070.01070.00052.60060.00060.0004
50-0.58700.01300.0002-0.60240.0024<0.0001-0.60150.0015<0.0001
200-0.60540.0054<0.0001-0.60230.0023<0.0001-0.60450.0045<0.0001
500-0.59960.0004<0.0001-0.59860.0014<0.0001-0.59680.0032<0.0001
50-0.37890.02110.0005-0.37570.02430.0006-0.38040.01960.0004
200-0.42970.02970.0009-0.42850.02850.0008-0.40550.0055<0.0001
500-0.42310.02310.0005-0.41160.01160.0001-0.40340.0034<0.0001
NBP501.02300.02300.00065.38540.38540.1486150.63490.63490.4031
2001.00600.00600.00025.05120.05120.0027150.72270.72270.5224
5001.00100.0010<0.00015.00360.0036<0.0001150.58300.58300.3399
500.13180.03180.00100.13040.03040.00090.07540.02460.0006
2000.11880.01880.00040.12550.02550.00070.08590.01410.0002
5000.10880.00880.00010.11060.01060.00020.09710.0029<0.0001
Ordinal process
500.5820.01800.00030.60820.00820.00010.62540.02540.0007
2000.59110.00890.00010.58230.01770.00030.61160.01160.0001
5000.59420.0058<0.00010.61340.01340.00020.59250.00750.0001
500.14280.04280.00180.08850.01150.00010.12430.02430.0006
2000.14660.04660.00220.09060.00940.00010.11810.01810.0003
5000.11580.01580.00050.09670.00330.00020.10880.00880.0003
50-0.88470.11530.0133-0.89490.10510.0111-0.85680.14320.0205
200-0.89060.10940.0120-0.89940.10060.0101-0.91760.08240.0068
500-0.94010.05990.0036-0.93010.06990.0049-0.93950.06050.0037
501.14290.14290.02040.74350.25650.06580.88730.11270.0127
2001.03090.03090.00101.14120.14120.01991.10310.10310.0106
5001.06970.06970.00490.91230.08770.00770.90010.09990.0100
501.43810.13810.01911.41460.11460.01321.42710.12710.0162
2001.39150.09150.00841.32190.02190.00051.36160.06160.0038
5001.37340.07340.00541.31270.01270.00021.32120.02120.0005
500.04760.04760.00230.07160.07160.00520.04190.04190.0018
2000.01340.01340.00020.04070.04070.00170.01810.01810.0003
5000.00590.0059<0.00010.00070.0007<0.00010.00090.0009<0.0001

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