

![0_image_0.png](0_image_0.png)

Figure 15: The quality qc employing the c parameter tends to select patterns (points) with small TP
values, while quality q, employing the g parameter will include also many patterns with large TP values (from the right part of the TP/FP space) that have a chance to be used in building conjunctions of high quality rules.

![0_image_1.png](0_image_1.png)

Figure 16: The left part of the TP/FP
space presenting the TP/FP
convex hulls of subgroups induced using quality measures g = TP/(FP + g) (thick line)
and qc = TP - c  FP (thin line) at data stage A. Labels A1-C1 denote positions of subgroups selected by the medical expert as interesting risk group descriptions.

![0_image_2.png](0_image_2.png)

