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. Author manuscript; available in PMC: 2018 Aug 3.
Published in final edited form as: J Am Stat Assoc. 2017 Jun 29;112(520):1571–1586. doi: 10.1080/01621459.2016.1222286

Table 1.

Simulation results for length-biased data (20% censoring rate) for different values of π(πeff corresponds to the GMM estimator). Bias: average bias of the estimate; SE: average variance of the estimate; MSE: mean squared error of the estimate.

π τ Estimators n = 200 n = 400


Bias SE MSE Bias SE MSE
0.00 0.25 β̂(0)(τ) −0.033 0.297 0.089 −0.047 0.184 0.036
β̂(1)(τ) −0.087 0.511 0.269 0.032 0.346 0.121
β̂(2)(τ) 0.022 0.308 0.095 0.002 0.176 0.031
0.50 β̂(0)(τ) −0.026 0.226 0.052 −0.020 0.108 0.012
β̂(1)(τ) −0.054 0.356 0.129 0.009 0.234 0.055
β̂(2)(τ) 0.021 0.243 0.059 −0.001 0.125 0.016

0.50 0.25 β̂(0)(τ) −0.023 0.254 0.065 −0.030 0.174 0.031
β̂(1)(τ) −0.062 0.481 0.236 0.011 0.334 0.112
β̂(2)(τ) 0.005 0.260 0.068 −0.008 0.169 0.029
0.50 β̂(0)(τ) −0.014 0.142 0.020 −0.012 0.115 0.013
β̂(1)(τ) −0.034 0.319 0.103 0.000 0.231 0.053
β̂(2)(τ) 0.008 0.167 0.028 −0.009 0.123 0.015

1.00 0.25 β̂(0)(τ) −0.048 0.287 0.084 −0.035 0.191 0.038
β̂(1)(τ) −0.046 0.582 0.341 −0.019 0.365 0.133
β̂(2)(τ) 0.016 0.286 0.082 0.010 0.191 0.036
0.50 β̂(0)(τ) −0.027 0.168 0.029 −0.014 0.123 0.015
β̂(1)(τ) −0.028 0.353 0.125 −0.009 0.253 0.064
β̂(2)(τ) 0.014 0.203 0.041 0.001 0.128 0.016

πeff 0.25 β̂(0)(τ) −0.044 0.198 0.041 −0.045 0.154 0.026
β̂(1)(τ) 0.039 0.389 0.153 −0.090 0.304 0.100
β̂(2)(τ) −0.036 0.176 0.032 0.078 0.130 0.023
0.50 β̂(0)(τ) 0.010 0.136 0.019 −0.009 0.091 0.008
β̂(1)(τ) 0.067 0.263 0.073 −0.085 0.210 0.051
β̂(2)(τ) −0.076 0.124 0.021 0.041 0.100 0.012