Efficiently Identifying Exploratory Rules’ Significance - Data Mining: Theory, Methodology, Techniques, and Applications - page 74

we chose to decide the significance of impact rules is 0.05. The minimum coverage
for discovered impact rules is set to 0.01, which is very low. The running time
shown in the figures and tables are CPU time spent for the algorithms to search
for top 1000 significant impact rules with the highest impact on a computer with
two PIII 933MHz processors, 1.5G memory, and 4G virtual memory.
We ran our original algorithm without the two eciency improving tech-
niques. For databases abalone, heart, housing, German credit and ipmus.la.97 ,
which are relatively smaller, we set the maximum number of conditions on

(a) (b)

(c) (d)

(e)

Fig. 4. Comparison of Running Time before and after applying data access saving
techniques for (a) abalone ,(b) heart ,(c) housing ,(d) German credit ,and(e) ipums.la.97
with maximum number of conditions allowed on rule antecedent set to 3-8, and with
no restriction on maximum number of conditions allowed on rule antecedent