Data | Variable | Traditional factor analysis | Robust factor analysis | |||||||
Before rotation | After rotation | Before rotation | After rotation | |||||||
Factor 1 | Factor 2 | Factor 1 | Factor 2 | Factor 1 | Factor 2 | Factor 1 | Factor 2 | |||
Normal set of data | X1 | 0.665 | -0.696 | −0.0124 | 0.9623 | 0.687 | −0.701 | 0.0505 | 0.9801 | |
X2 | 0.714 | -0.666 | 0.0439 | 0.9750 | 0.715 | −0.688 | 0.0805 | 0.9890 | ||
X3 | 0.761 | −0.595 | 0.1270 | 0.9577 | 0.678 | −0.695 | 0.0478 | 0.9701 | ||
X4 | 0.840 | 0.395 | 0.8762 | 0.3059 | 0.873 | 0.332 | 0.8739 | 0.3294 | ||
X5 | 0.859 | 0.412 | 0.9016 | 0.3068 | 0.864 | 0.415 | 0.9217 | 0.2614 | ||
X6 | 0.614 | 0.685 | 0.9182 | −0.0591 | 0.689 | 0.641 | 0.9408 | −0.0234 | ||
X7 | 0.333 | 0.853 | 0.8352 | −0.3761 | 0.433 | 0.820 | 0.8680 | −0.3278 | ||
Data with an outlier | X1 | 0.602 | 0.764 | 0.00473 | 0.9727 | 0.606 | −0.772 | 0.0505 | 0.9801 | |
X2 | 0.796 | 0.570 | 0.27701 | 0.9395 | 0.673 | −0.730 | 0.0805 | 0.9890 | ||
X3 | 0.783 | 0.586 | 0.25685 | 0.9434 | 0.650 | −0.740 | 0.0478 | 0.9701 | ||
X4 | 0.923 | −0.285 | 0.90261 | 0.3434 | 0.830 | 0.413 | 0.8739 | 0.3294 | ||
X5 | 0.935 | −0.292 | 0.91678 | 0.3449 | 0.852 | 0.403 | 0.9217 | 0.2614 | ||
X6 | 0.783 | −0.505 | 0.92830 | 0.0834 | 0.725 | 0.589 | 0.9408 | −0.0234 | ||
X7 | 0.772 | −0.571 | 0.96012 | 0.0251 | 0.413 | 0.792 | 0.8680 | −0.3278 | ||
Data with four outliers | X1 | 0.655 | 0.717 | 0.0657 | 0.969 | 0.687 | −0.701 | 0.0505 | 0.9801 | |
X2 | 0.849 | 0.478 | 0.3664 | 0.903 | 0.715 | −0.688 | 0.0805 | 0.9890 | ||
X3 | 0.837 | 0.514 | 0.3351 | 0.923 | 0.678 | −0.695 | 0.0478 | 0.9701 | ||
X4 | 0.875 | −0.361 | 0.9094 | 0.262 | 0.873 | 0.332 | 0.8739 | 0.3294 | ||
X5 | 0.850 | −0.369 | 0.8952 | 0.240 | 0.864 | 0.415 | 0.9217 | 0.2614 | ||
X6 | 0.845 | −0.434 | 0.9312 | 0.187 | 0.689 | 0.641 | 0.9408 | −0.0234 | ||
X7 | 0.771 | −0.401 | 0.8536 | 0.166 | 0.433 | 0.820 | 0.8680 | −0.3278 | ||