Hester van Eeren

| Chapter 4 4 | 68 Table 2. MSE of simulations Sample size Correlation covariates X1, X2, X3 Correlation Z - X1,X2,X3 Variables in propensity score (PS) model Univariate PS X2, X3 X1, X2, X3 X2, X3, Z X1, X2, X3, Z Scenario 1* N = 250 0 Absent MSE 0.0523 0.0579 0.0642 0.0605 Present MSE 0.0524 0.0561 0.0641 0.0583 0.3 Absent MSE 0.0491 0.0562 0.0618 0.0608 Present MSE 0.0556 0.0683 0.0687 0.0724 0.7 Absent MSE 0.0481 0.0518 0.0593 0.0592 Present MSE 0.0657 0.0792 0.0926 0.0907 N = 500 0 Absent MSE 0.0261 0.0294 0.0330 0.0311 Present MSE 0.0292 0.0264 0.1095 0.0306 0.3 Absent MSE 0.0245 0.0285 0.0318 0.0311 Present MSE 0.0294 0.0381 0.0328 0.0394 0.7 Absent MSE 0.0270 0.0248 0.0313 0.0315 Present MSE 0.0331 0.0432 0.0489 0.0494 N = 1000 0 Absent MSE 0.0132 0.0148 0.0160 0.0154 Present MSE 0.0130 0.0146 0.0160 0.0152 0.3 Absent MSE 0.0124 0.0141 0.0158 0.0153 Present MSE 0.0162 0.0214 0.0174 0.0227 0.7 Absent MSE 0.0121 0.0131 0.0153 0.0964 Present MSE 0.0174 0.0256 0.0270 0.0290 Scenario 2* N = 250 0 Absent MSE 0.0537 0.0575 0.0994 0.0678 Present MSE 0.0576 0.0622 0.1116 0.0770 0.3 Absent MSE 0.0525 0.0604 0.1117 0.0850 Present MSE 0.0605 0.0717 0.1382 0.0763 0.7 Absent MSE 0.0512 0.0558 0.0944 0.0872 Present MSE 0.0684 0.0809 0.1901 0.1042 N = 500 0 Absent MSE 0.0289 0.0330 0.0682 0.0427 Present MSE 0.0269 0.0295 0.0660 0.0383 0.3 Absent MSE 0.0245 0.0279 0.0702 0.0467 Present MSE 0.0317 0.0394 0.0943 0.0390 0.7 Absent MSE 0.0259 0.0283 0.0634 0.0560 Present MSE 0.0370 0.0443 0.1483 0.0633 N = 1000 0 Absent MSE 0.0128 0.0145 0.0453 0.0219 Present MSE 0.0145 0.0161 0.0502 0.0249 0.3 Absent MSE 0.0127 0.0146 0.0523 0.0308 Present MSE 0.0173 0.0220 0.0713 0.0203 0.7 Absent MSE 0.0121 0.0129 0.0468 0.0384 Present MSE 0.0189 0.0247 0.1193 0.0395 *Results in italic indicate MSE was closest to zero. MSE indicates mean squared error; PS, propensity score.