Figure 4
Minimizing the difference of the interactions. 95th centiles of the distributions of proportionate changes from expected for randomisation weights from 1 to 100 obtained from 5000 simulations. All 10 2-way interactions from 5 prognostic factors (3 binary, 1 3-category, 1 4-category) used as minimisation criteria. Dotted lines show results when prognostic factors are weighted according to the number of categories. Results for the 3 2 × 2 interaction terms shown in black, for the 3 2 × 3 interactions in dark green, the 3 2 × 4 in lime green and the 1 3 × 4 interaction in red.