a look at data mining presented by: charles hollingsworth flavia peynado ritch overton dsc8020,...
TRANSCRIPT
A Look at Data Mining
Presented by:
Charles Hollingsworth
Flavia Peynado
Ritch Overton
DSc8020, Group Presentation, July 31, 2002
What is Data Mining?
It may be described as the process of extracting previously unidentified, valid, and actionable information from large databases and then using the information to make crucial business decisions.
Why the need for data mining?
Business environment is constantly changing. Customer Behavior Patterns Market Saturation New niche markets Increased commoditization Time to market Shorter product life cycles Increased competition and business risks
Drivers The Customer Products Competition Operations/Data
Assets.
Enablers Data flood Growth of data
warehousing New IT solutions New research in
machine learning
Process overview contd.
1. Business Understanding
2. Data understanding
3. Data Preparation
4. Data Transformation
5. Data Mining
6. Analysis of results
7. Assimilation of results
Effort needed at each stage of data mining
0
10
20
30
40
50
60
Effort
Visualization
Goal is to provide a summary and overview of a dataset
Promotes Understanding: Deconstructive process
Promotes Trust: Constructive process
Narrows the gap between human and computer during data analysis
Types of Visualization Tools
Histograms Bar Charts Scatter plots Pie Charts Line Plots
Time-Series Plots Decision Trees
Coxcomb Plots Stereograms Mosley’s X-ray’s
Histogram
Graphically illustrates how many observations fall in various categories
Histogram for Diameter
0
20
40
60
80
100
Category
Bar Chart
Categories are placed on the vertical axis, instead of the horizontal axis in a histogram
Scatter Plot
Scatter Plot
0
5
10
15
20
25
0 50 100 150 200
Domestic Gross
Sa
lary
Salary
Graphical representation of the relationship between two variables.
Pie Chart
Radii are used to divide a circle into wedges. The resulting angles represent the values of the wedges.
Spring 2000 Salary Survey
<$30,000
$30,000 to $39,999
$40,000 to $49,999
$50,000 to $59,999
$60,000 to $69,999
More than $70,000
No Answer
Line Plot
Connects consecutive data points to enhance visualization
Time-Series Plot: Playfair’s
•Helpful in forecasting future values
•Time variable is placed on the horizontal axis
•Makes patterns in data more apparent
•The area between two time-series curves was emphasized to show the difference between them, representing the balance of trade.
Decision Trees
Conventions for Decision Trees:
1. Composed of nodes (points in time) and branches (possible decisions).
2. Squares represent decision nodes, circles represent probability nodes, triangles represent end nodes.
3. Probabilities are listed on probability branches.
4. Monetary values are listed on the branches where they occur.
5. Decision maker has no control over probability branches.
Decision Trees
Coxcomb Plot
In 1858, Florence Nightingale constructed graphs of her own design, which she called “Coxcombs".
The radii in a Coxcomb vary as opposed to the angle of the wedge in a pie chart.
Stereogram
Luigi Perozzo, from the Annali di Statistica, 1880
The population of Sweden from 1750-1875 by age groups
Mosley’s X-ray’s
Caused Henry Mosley to discover that the atomic number is more than a serial number; that it has some physical basis. Moseley proposed that the atomic number was the number of electrons in the atom of the specific element.
Other Visualization Tools
Doughnut Area Chart Box Plot Radar
Algorithms
Predictive
Regression Classification
Descriptive Parallel Formulation
of Classification Association Rule
Discovery Sequential Pattern
Discovery Analysis Clustering
Applying
Relevance to managers
Decreasing Costs Valuing Appropriately Effective Implementation
Conclusion
Converging Developments Data compilation Processing power Maturing Algorithms Visualization
Accessible Resources