Table 3.
Simulation results with sample sizes N = 200,400. ps is the propor tion of non-ignorable dropouts due to death and treatment failure. pe is the proportion of outlying observations in the longitudinal model. β10, β11, β21, and β31 are the average estimates in 500 simulations, with standard deviation in parenthesis. SD is the average estimated standard errors. CP is the coverage probability for the 95% confidence interval. The true values of the regression coefficients are (β10, β11, β21, β31) = (2, 2, 2, 2).
N | ps | pe | β 10 | SD(β10) | CP | β 11 | SD(β11) | CP |
---|---|---|---|---|---|---|---|---|
200 | 0.2 | 0 | 2.01 ( 0.14 ) | 0.13 | 92 % | 2.00 ( 0.09 ) | 0.08 | 94 % |
0.10 | 2.00 ( 0.14 ) | 0.13 | 93 % | 2.00 ( 0.09 ) | 0.10 | 96 % | ||
0.25 | 1.99 ( 0.17 ) | 0.15 | 92 % | 2.00 ( 0.12 ) | 0.13 | 95 % | ||
0.5 | 0 | 2.01 ( 0.15 ) | 0.14 | 91 % | 2.00 ( 0.09 ) | 0.09 | 95 % | |
0.10 | 2.02 ( 0.17 ) | 0.15 | 93 % | 2.01 (0.11) | 0.10 | 92 % | ||
0.25 | 2.00 ( 0.19 ) | 0.17 | 92 % | 2.02 ( 0.12 ) | 0.13 | 96 % | ||
400 | 0.2 | 0 | 2.01 ( 0.10 ) | 0.10 | 94 % | 2.00 ( 0.06 ) | 0.06 | 92 % |
0.10 | 2.01 (0.11) | 0.10 | 94 % | 2.00 ( 0.07 ) | 0.07 | 93 % | ||
0.25 | 2.01 ( 0.12 ) | 0.11 | 93 % | 2.00 ( 0.08 ) | 0.08 | 96 % | ||
0.5 | 0 | 2.02 ( 0.11 ) | 0.10 | 93 % | 2.00 ( 0.07 ) | 0.06 | 93 % | |
0.10 | 2.02 ( 0.12 ) | 0.11 | 93 % | 2.00 ( 0.08 ) | 0.07 | 94 % | ||
0.25 | 2.02 ( 0.13 ) | 0.12 | 93 % | 2.00 ( 0.09 ) | 0.09 | 96 % |
N | ps | pe | β 21 | SD(β21) | CP | β 31 | SD(β31) | CP |
---|---|---|---|---|---|---|---|---|
200 | 0.2 | 0 | 2.00 ( 0.20 ) | 0.16 | 92 % | 1.93 ( 0.23 ) | 0.17 | 82 % |
0.10 | 2.01 ( 0.20 ) | 0.17 | 90 % | 1.92 ( 0.24 ) | 0.17 | 81 % | ||
0.25 | 2.03 ( 0.20 ) | 0.17 | 89 % | 1.95 ( 0.26 ) | 0.17 | 79 % | ||
0.5 | 0 | 2.02 ( 0.21 ) | 0.18 | 92 % | 1.90 ( 0.22 ) | 0.14 | 73 % | |
0.10 | 2.03 ( 0.21 ) | 0.18 | 92 % | 1.90 ( 0.23 ) | 0.14 | 73 % | ||
0.25 | 2.03 ( 0.22 ) | 0.18 | 91 % | 1.89 ( 0.22 ) | 0.14 | 73 % | ||
400 | 0.2 | 0 | 2.00 ( 0.14 ) | 0.11 | 91 % | 1.98 ( 0.18 ) | 0.12 | 80 % |
0.10 | 2.01 ( 0.14 ) | 0.12 | 91 % | 1.98 ( 0.18 ) | 0.12 | 80 % | ||
0.25 | 2.01 ( 0.14 ) | 0.12 | 91 % | 1.97 ( 0.18 ) | 0.12 | 79 % | ||
0.5 | 0 | 2.01 ( 0.15 ) | 0.13 | 89 % | 1.96 ( 0.17 ) | 0.10 | 71 % | |
0.10 |
2.02 ( 0.15 ) | 0.13 | 90 % | 1.95 ( 0.17 ) | 0.10 | 73 % | ||
0.25 | 2.02 ( 0.15 ) | 0.13 | 90 % | 1.95 ( 0.17 ) | 0.10 | 72 % |