E E 3J2 D ata M ining L ecture 3 Z ipf's L aw Stem m ing & Stop L ists
E E 3J2 D ata M ining L ecture 3 Z ipf's L aw Stem m ing & Stop L ists
E E 3J2 D ata M ining L ecture 3 Z ipf's L aw Stem m ing & Stop L ists
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Example<br />
Apply the Porter stemmer to the ‘Jane Eyre’ and<br />
‘Alice in Wonderland’ texts<br />
34%<br />
reduction<br />
16000<br />
14000<br />
12000<br />
10000<br />
Before stemm<strong>ing</strong><br />
8000<br />
After <strong>Stem</strong>m<strong>ing</strong><br />
22%<br />
reduction<br />
6000<br />
4000<br />
2000<br />
Number of different words<br />
0<br />
Alice Jane Eyre<br />
Text<br />
EE<strong>3J2</strong> D<strong>ata</strong> M<strong>in<strong>ing</strong></strong> 2008 – l<strong>ecture</strong> 3<br />
Slide 26
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