Analysis of longitudinal semicontinuous data using marginalized two-part model

Table 5 Simulation results for mTP, TP with correlated random intercepts, TP with uncorrelated random intercepts, and one-part model using simulated data with (a) proportion of zeros is 30% and (b) proportions of zeros is 50%

Model	(a) 30% zero proportion		(b) 50% zero proportion
Model	Bias*10	MSE*10	Bias*10	MSE*10
mTP	0.0914	0.0022	0.0915	0.0025
TP with correlated intercepts	− 0.1416	0.1903	− 0.1490	0.2134
TP with uncorrelated intercepts	− 0.1522	0.232	− 0.1522	0.232
One-part	− 0.1671	0.246	− 0.1692	0.253

1000 simulations with sample size of 200 were generated with (a) 9 repeated measures and (b) 12 repeated measures

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