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Introduction to Data Mining

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S
Sushil Kulkarni

This lecture gives various definitions of Data Mining. It also gives why Data Mining is required. Various examples on Classification , Cluster and Association rules are given.

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Introduction to Data Mining Dr. Sushil Kulkarni Jai Hind College (sushiltry@yahoo.co.in)
— Introduction to database — A Problem and A Solution — What Is Data Mining? — Goal of Data Mining — What is (not) Data Mining? — Convergence of 3 key Technologies — Data mining Functions — Kinds of Data Mining Problems Road Map
What is Database? ,[object Object]
Examples ,[object Object]
Examples ,[object Object]
Examples ,[object Object]
Data vs. information ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Why do we need a database? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Purpose of Database system Data Information Knowledge Action Is to transform
Database ,[object Object],[object Object]
Who and How to do it ? ,[object Object],[object Object],[object Object]
hmm.. Let’s jump to Data Mining ,[object Object]
A Problem … ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
A Solution … ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
KDD Process ,[object Object],[object Object],[object Object]
Steps of KDD Process ,[object Object],[object Object],[object Object]
Steps of KDD Process ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Steps of KDD Process ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What Is Data Mining? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Why Data Mining? ,[object Object],[object Object],[object Object],[object Object],[object Object]
Goal of Data Mining ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Data Mining is …
What is (not) Data Mining? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DB VS DM Processing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Convergence of 3 key Technologies
1. Increasing Computing Power ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
1. The Data Explosion ,[object Object],[object Object],[object Object]
1. The Data Explosion Implications ,[object Object],[object Object],[object Object]
2. Improved Data Collection and Management ,[object Object],[object Object]
3. Statistical & Machine Learning Algorithms ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
3.Data/Information/Knowledge/Wisdom ,[object Object],[object Object]
Data mining Functions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Data mining Functions
Predictive Model ,[object Object],[object Object],[object Object],— Large number of inputs usually available
Kinds of Data Mining problems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],Kinds of Data Mining problems
Classification Classification Model
Definition of Classification Problem Given a database D={t 1 ,t 2 ,…,t n } and a set of classes C={C 1 ,…,C m }, the Classification Problem is to define a mapping f: D  C where each t i is assigned to one class .
Example: Credit Card Training Set Learn Classifier Test Set Model
Another Example ... ,[object Object],Group 1: Delia Group 2: Roses Target Object (Experiment reported on in Cognitive Science, 2002) oopps
Resemblance ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Few More Examples ,[object Object],[object Object],[object Object]
Clustering ,[object Object],[object Object],[object Object]
Clustering ,[object Object],[object Object],[object Object],[object Object],Inter-cluster distances are maximized Intra-cluster distances are minimized
Clustering ,[object Object],[object Object]
Clustering ,[object Object],[object Object]
Outliers Cluster 1 Cluster 2 Outliers
What is a natural grouping among these objects? School Employees Tatkare’s Family Males Females Clustering is subjective
What is Similarity? The quality or state of being similar; likeness; resemblance; as, a similarity of features. Similarity is hard to define, but… “ We know it when we see it ” The real meaning of similarity is a philosophical question. We will take a more pragmatic approach. Webster's Dictionary
Clustering Problem ,[object Object],[object Object],[object Object]
Applications ,[object Object],[object Object]
Applications ,[object Object],[object Object]
Applications ,[object Object],[object Object],[object Object],[object Object],Clustering System Similarity measure Documents source Doc Doc Doc Doc Doc Doc Doc Doc Doc Doc ,[object Object],[object Object]
Association Rules ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Association Rule Discovery
Association Rule Discovery ,[object Object],[object Object],Rules Discovered: {Milk} --> {Coke} {Diaper, Milk} --> {Beer}
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Association Rule Discovery
A Weka bird is a strong brown bird which is native to New Zealand and grows to be about the same size as a chicken. The Weka was once fairly common on the North and South Islands of New Zealand but over the years has heavily declined on the North Island due to the major damage of their habitats.
[object Object],[object Object],[object Object],[object Object],WEKA is available at http:// www.cs.waikato.ac.nz/ml/weka
[object Object],[object Object],References
[object Object],[object Object],References: Yahoo Group
THANKS!!

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Introduction to Data Mining

  • 1. Introduction to Data Mining Dr. Sushil Kulkarni Jai Hind College (sushiltry@yahoo.co.in)
  • 2. — Introduction to database — A Problem and A Solution — What Is Data Mining? — Goal of Data Mining — What is (not) Data Mining? — Convergence of 3 key Technologies — Data mining Functions — Kinds of Data Mining Problems Road Map
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  • 9. Purpose of Database system Data Information Knowledge Action Is to transform
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  • 25. Convergence of 3 key Technologies
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  • 38. Definition of Classification Problem Given a database D={t 1 ,t 2 ,…,t n } and a set of classes C={C 1 ,…,C m }, the Classification Problem is to define a mapping f: D  C where each t i is assigned to one class .
  • 39. Example: Credit Card Training Set Learn Classifier Test Set Model
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  • 47. Outliers Cluster 1 Cluster 2 Outliers
  • 48. What is a natural grouping among these objects? School Employees Tatkare’s Family Males Females Clustering is subjective
  • 49. What is Similarity? The quality or state of being similar; likeness; resemblance; as, a similarity of features. Similarity is hard to define, but… “ We know it when we see it ” The real meaning of similarity is a philosophical question. We will take a more pragmatic approach. Webster's Dictionary
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  • 58. A Weka bird is a strong brown bird which is native to New Zealand and grows to be about the same size as a chicken. The Weka was once fairly common on the North and South Islands of New Zealand but over the years has heavily declined on the North Island due to the major damage of their habitats.
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