Table 5  Analysis of SSE content rules over different subsets
Subset  #. of rules  Fraction(%)  c o n f 1 a  #. of SSE rules  c o n f 2 b
SSE  c  22  14.01%  0.533  -  -
TOPK  d  31  19.75%  0.642  13  0.661
Unique  e  58  36.94%  0.536  16  0.622
acon f1: Average confidence of a rule subset;
bcon f2: Average confidence of SSE content rules in a rule subset;
cSSE: Association rules encoding SSE content;
dTOPK: Top K rules covering top 20% in confidence;
eUnique: Unique rules.