n=20   0% 10% 20% 30% 40%     θ1 θ2 θ1 θ2 θ1 θ2 θ1 θ2 θ1 θ2 Least-Squares Bias 0.0375 0.1083 25342.0 45178 8582 6952 2406 5184 1603 4015 MSE 0.0479 0.4842 5.5E+9 1.5E+10 4.6E+9 2.1E+9 3.2E+8 2.2E+9 1.0E+8 1.4E+9 MEP 5.0375 1.1083 25347 45179 8587 6953 2411 5185 1608 4016 Robust Method Bias 0.0901 0.1525 0.0762 0.0895 0.0081 0.0599 0.1191 0.1685 0.0176 0.0417 MSE 0.0534 0.5646 0.1676 0.3112 0.1484 0.6847 0.2901 0.7813 0.2539 0.7448 MEP 5.0701 1.1327 5.0762 1.0895 4.9919 1.0599 5.1191 1.1685 5.0176 0.0417 n=50   0% 10% 20% 30% 40%     θ1 θ2 θ1 θ2 θ1 θ2 θ1 θ2 θ1 θ2 Least-Squares Bias 0.0131 0.1430 660 892 583 582 566 478 559 404 MSE 0.0396 0.2566 455959 1.0E+6 345138 437874 323227 252951 314270 176481 MEP 5.0131 1.0414 665 893 588 583 571 479 564 405 Robust Method Bias 0.0701 0.1625 0.0173 0.0736 0.0892 0.1767 0.0399 0.0059 0.01445 0.0256 MSE 0.2167 0.5221 0.0526 0.3141 0.0746 0.4530 0.0474 0.2435 0.0857 0.4877 MEP 5.0701 1.1131 4.9827 1.0736 5.0892 1.1767 4.9601 1.0060 4.9856 1.0256

Table 5: Bias, Mean Square Errors (MSE) and Mean Estimated Parameter (MEP) with Percentage Contamination in the X-Y-Direction.