Neil W. Polhemus, CTO, StatPoint Technologies, Inc.

Overview of Data Analysis Using Statgraphics Centurion

Copyright 2011 by StatPoint Technologies, Inc.

Web site: www.statgraphics.com

What is Statgraphics?

2

Statgraphics is a data analysis and data visualization program that runs as a standalone application under Microsoft Windows.

It is designed to make it easy to take data from various data sources (such as Excel or databases) and extract the important information from that data.

Short History First version of Statgraphics for PC’s was released in 1983.

Earliest major stat package for PCs and the first to incorporate graphics directly into every statistical procedure.

Current version is Version 16 with more than 170 procedures.

Desktop application now called “Statgraphics Centurion” to distinguish it from early versions marketed by Manugistics and from our “Statgraphics Online” product.

3

Data Analysis Model

4

Data source (Excel,

database, text file)

Output (printer, Word,

PowerPoint, Excel, HTML)

Statgraphics analytics

Types of Data Analysis

Exploratory data analysis (data mining) – not sure ahead of time what methods will be needed.

Repetitive data processing – repeats a pre-selected set of methods on different data sets or at different times.

5

Example: Countries of the world

6

Main Window

7

DataBookNavigationbar

Main toolbarAnalysis toolbar

Statgraphics DataBook

8

Tabulation

9

BALTICS (3)

EASTERN EUROPE (12)

NEAR EAST (16)

OCEANIA (21)

SUB-SAHARAN AFRICA (51)

WESTERN EUROPE (28)

Piechart for Region

ASIA (EX. NEAR EAST) (28)

C.W. OF IND. STATES (12)

LATIN AMER. & CARIB (45)

NORTHERN AFRICA (6)NORTHERN AMERICA (5)

Variable of interest: infant mortality

10

Box-and-whisker plot

11

Frequency Histogram

12

Histogram

-10 30 70 110 150 190 230Infant mortality

0

20

40

60

80

freq

uenc

y

LOG Transformation

13

Histogram

0 1 2 3 4 5 6LOG(Infant mortality)

0

5

10

15

20

25

30

freq

uenc

y

Summary Statistics & StatAdvisor

14

Save Session as a StatFolio

15

Save Results to Other Applications

16

Save All Results in StatReporter

17

Save results as HTML using StatPublish

18

Multivariate AnalysisLooking at more than one column simultaneously requires

different techniques, such as:

1. Correlation analysis2. Matrix plot3. Cluster analysis

19

Correlations

20

Matrix Plot

21

Infant Mortality

LOG(GDP)

Literacy

LOG(Phones)

Birthrate

Deathrate

Agriculture

Industry

Service

2-D ScatterplotUseful for plotting 2 dimensions.

22

3-D ScatterplotUseful for plotting 3 dimensions.

23

Plot of Infant mortality vs LOG(GDP) and Literacy

6.2 7.2 8.2 9.2 10.2 11.2LOG(GDP)

0 20 40 60 80 100

Literacy

0

40

80

120

160

200

Infa

nt m

orta

lity

RegionASIA (EX. NEAR EAST) BALTICS C.W. OF IND. STATES EASTERN EUROPE LATIN AMER. & CARIB NEAR EAST NORTHERN AFRICA NORTHERN AMERICA OCEANIA SUB-SAHARAN AFRICA WESTERN EUROPE

Cluster Analysis

24

Cluster Plot

25

Cluster ScatterplotWard's Method,Squared Euclidean

0 40 80 120 160 200Infant mortality

0 20 40 60 80 100

Literacy

0

200

400

600

800

1000

1200

Phon

es

Cluster 123Centroids

Dendrogram

26

More InformationGo to www.statgraphics.com

Or send e-mail to info@statgraphics.com

27