January 2011
Intermediate to advanced
420 pages
12h 32m
English
Content preview from Practical Applications of Data Mining
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3.5 partial deCision tree 123
If 4. tear production rate is normal and astigmatism is yes and spectacle prescrip-
tion is hypermetropic and age is presbyopic, then the recommended contact lens
is none.
If 5. tear production rate is normal and astigmatism is yes and spectacle prescrip-
tion is hypermetropic and age is young, then the recommended contact lens is
hard.
If 6. tear production rate is normal and astigmatism is yes and spectacle prescrip-
tion is hypermetropic and age is pre-presbyopic, then the recommended contact
lens is none.
When we compare the rules generated before and after post-pruning, we
can see that the number of rules drops from nine to six, at the expense of the
accuracy dropping from 100% to 23/24 = 95.8%. When compar ...