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12. Feature Selection
FEATURE SELECTION
Select the input attributes that matter
1. When the number of features or attributes is really large -> computational
expense is a criterion
2. Attributes are confounded
Methods
PRINCIPAL COMPONENT ANALYSIS
PCA
Sample dataset
RM Process
Eigenvectors
INFORMATION THEORY–
BASED FILTERING
CHI-SQUARE-BASED
FILTERING
Chi-Square
fo is the observed frequency and fe is the expected frequency
WRAPPER-TYPE
FEATURE SELECTION
Concept
Iteratively chooses features to add or to remove from the current attribute pool based on whether the
newly added or removed attribute improves the accuracy.
Backward elimination
RM Process
RM Process
Feature selection

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14. Feature Selection.pptx