摘要
The second order approach of local influence (see [15]) is developed and applied to Cox's proportional hazards model, and compared with Cook's local influence approach (see [6] and [13]) which was used in this model. To study local influence, we perturb not only all cases simultaneously, but also cases individually to obtain 'direction curvature' in direction and 'curvature' for single case. Some examples are used to illustrate these methods.
The second order approach of local influence (see [15]) is developed and applied to Cox's proportional hazards model, and compared with Cook's local influence approach (see [6] and [13]) which was used in this model. To study local influence, we perturb not only all cases simultaneously, but also cases individually to obtain 'direction curvature' in direction and 'curvature' for single case. Some examples are used to illustrate these methods.
