A simple introduction to weka
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A SIMPLE INTRODUCTION TO WEKA
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Contents What is WEKA? WEKA Explorer Preprocessing the data Classification Clustering Association Rules Attribute Selection Data Visualization
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Waikato Environment for Knowledge Analysis
Developed by Department of Computer Science, University of Waikato, New Zealand.
Weka is also a bird found only on theislands of New Zealand.
1 What is WEKA?
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A collection of machine learning algorithmsfor data mining tasks.
Download and Install WEKA
Website:http://www.cs.waikato.ac.nz/~ml/weka/index.html
Platform independent
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Exploratory data analysis
Experimental environment
New process model inspired interface
Command Line Interface
WEKA GUI
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WEKA Explorer
2
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Preprocessing the data
Classification
Clustering
Association Rules
Attribute Selection
Data Visualization
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“Pre-Processing the data
Data can be imported from a file in various formats.ARFF-Attribute-Relation File FormatCSV - Comma Separated Values
Data can be read from a URL or from a SQL database.
Filters are used for pre-processing
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@relation heart-disease-simplified
@attribute age numeric@attribute sex { female, male}@attribute chest_pain_type { typ_angina, asympt, non_anginal, atyp_angina}@attribute cholesterol numeric@attribute exercise_induced_angina { no, yes}@attribute class { present, not_present}
@data63,male,typ_angina,233,no,not_present67,male,asympt,286,yes,present67,male,asympt,229,yes,present38,female,non_anginal,?,no,not_present...
WEKA only deals with flat files
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Building Classifiers Classifiers in WEKA are models for predicting nominal
or numeric quantities
Implemented learning schemes include:
Decision trees and lists, instance-based classifiers, support vector machines, multi-layer perceptron, logistic regression, Bayes’ nets, …
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age income student credit_rating buys_computer<=30 high no fair no<=30 high no excellent no31…40 high no fair yes>40 medium no fair yes>40 low yes fair yes>40 low yes excellent no31…40 low yes excellent yes<=30 medium no fair no<=30 low yes fair yes>40 medium yes fair yes<=30 medium yes excellent yes31…40 medium no excellent yes31…40 high yes fair yes>40 medium no excellent no
Decision Tree Induction: Training Dataset
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age?
overcast
student? credit rating?
<=30 >40
no yes yes
yes
31..40
nofairexcellentyesno
Output: A Decision Tree for “buys_computer”
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Clustering data Finding groups of similar instances in a
dataset
Implemented schemes in WEKA are:k-Means, EM, Cobweb, X-means, FarthestFirst
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Finding Associations WEKA contains an implementation of the Apriori
algorithm for learning association rules
Works only with discrete data
Can identify statistical dependencies between groups of attributes:
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Used to determine the most predictive attributes
Consists of two parts
1.) A search method : best-first, forward selection, random, exhaustive, genetic algorithm and etc.
2.)An evaluation method : correlation-based, wrapper, information gain an etc.
Attribute Selection
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Data Visualization WEKA can visualize single attributes (1-d) and
pairs of attributes (2-d)
Color-coded class values
Use of “jitter” option
“Zoom-in” function
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