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Neil W. Polhemus, CTO, StatPoint Technologies, Inc.
Multivariate Data Analysis
Using Statgraphics Centurion:
Part 1
Copyright 2013 by StatPoint Technologies, Inc.
Web site: www.statgraphics.com
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Multivariate Statistical Methods
The simultaneous observation and analysis of more than one
response variable.
*Primary Uses
1. Data reduction or structural simplification
2. Sorting and grouping
3. Investigation of the dependence among variables
4. Prediction
5. Hypothesis construction and testing
*Johnson and Wichern, Applied Multivariate Statistical Analysis
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STATGRAPHICS Contents
Plot – Multivariate Visualization
Scatterplot matrix
Parallel coordinates plot
Andrews plot
Star glyphs and sunray plots
Chernoff faces
Describe – Multivariate Methods Correlation analysis
Principal components analysis
Factor analysis
Canonical correlations
Cluster analysis
Correspondence analysis
Multiple correspondence analysis 3
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STATGRAPHICS Contents
Compare – Analysis of Variance
General Linear Models – MANOVA
Relate – Multiple Factors
Partial Least Squares
Relate – Classification Methods Discriminant analysis
Neural networks Bayesian classifier
SPC – Control Charts – Multivariate Control Charts
T-Squared Chart
Multivariate EWMA Chart
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Uniwin from Sigma Plus
Package of multivariate statistical methods that read Statgraphics data
files.
Additional features for:
Principal components analysis
Simple and multiple correspondence analysis
Cluster analysis
Other procedures: Factor analysis for mixed data (quantitative and qualitative)
Multiple factorial analysis and STATIS – two methods for three-way tables
Classical multidimensional scaling
Confidence and tolerance ellipses
Qualitative discriminant analysis
Scoring
Principal components regression 5
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Dataset – countries of the world.sgd
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Multivariate Methods Webinar – Part 1
1. Correlation analysis
2. Partial correlation analysis
3. Parallel coordinates plot
4. Principal components analysis (PCA)
5. Factor analysis
6. Multivariate T-squared chart
7. Additional features using UNIWIN (supplementary variables
for PCA and multidimensional scaling)
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Variables for this Study (circa 2006)
1. Pop. Density – inhabitants per square km
2. Farmable - % of land usable for growing crops
3. Birth rate – annual births per 1,000 of population
4. Literacy - % of population classified as literate
5. Infant mortality – deaths of infants under 1 year old per
100 live births
6. GDP – Gross Domestic Product per capita
7. Death rate – annual deaths per 1,000 of population
8. Agriculture – proportion of GDP attributable to
agriculture
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Matrix Plot – gives initial view of the data
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Box-Cox Transformations
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Variable Stnd.
skewness
Optimal Box-
Cox power
Selected
transformation
Stnd. Skewness
after
transformation
Pop. density 50.96 0.027 Log -1.58
Farmable 5.86 0.386 Square root 0.32
Birthrate 4.33 -0.083 Log 0.43
Literacy -7.19 3.419 Cube -3.97
Infant mortality 8.74 0.002 Log -0.27
GDP 8.44 0.065 Log -0.82
Deathrate 10.07 -0.175 Log 1.58
Agriculture 8.43 0.254 Cube root 0.81
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Matrix Plot – transformed data
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Correlation Analysis
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Estimates linear correlations between pairs of variables.
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Partial Correlation Analysis
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Estimates correlations between pairs of variables, adjusting for
effects of the other variables.
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Parallel Coordinates Plot
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Parallel Coordinates Plot – One Region
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Parallel Coordinates Plot – Adding USA
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(Region=“WESTERN EUROPE”)+2*(Country=“United States”)
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Principal Components Analysis (PCA)
Used to explain the variance-covariance structure of a set of
variables.
Converts a set of correlated variables into a set of linearly
uncorrelated variables.
P1 = a1,1X1 + a1,2X2 + … + a1,kXk
P2 = a2,1X1 + a2,2X2 + … + a2,kXk
…
Primary goals are data reduction and interpretation.
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Principal Components Analysis (PCA)
The first principal component is the linear combination of the
variables that explains the largest amount of the variance.
The second principal component is the linear combination
orthogonal to the first that explains the next greatest amount
of variance.
Often helps reveal the understanding structure in the data by
finding components that account for much of the variance.
Also used to build predictive models via Principal
Components Regression (PCR).
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Multivariate Point Cloud
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First principal component is dimension with maximum variance.
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PCA – Data Input
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PCA – Analysis Options
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Analysis Summary
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Scree Plot
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Used to determine how many components are important.
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Component Weights
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Shows the linear combinations defining the principal components.
Helpful in interpreting their meaning.
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2D Component Plot
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Plots the component weights for each variable.
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2D Scatterplot
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Shows the value of the first 2 components for each case.
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Coded Scatterplot
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Biplot
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Save Principal Components
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Factor Analysis
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Used to describe the variability amongst a set of correlated,
observed variables in terms of a smaller number of unobserved
variables.
The factor analysis model describes each observed variable as a
linear combination of common factors F and specific factors e.
X1 – m1 = l1,1F1 + l1,2F2 + … + l1,mFm + e1
X2 – m2 = l2,1F1 + l2,2F2 + … + l2,mFm + e2
…
The coefficients are referred to as factor loadings.
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Factor Analysis – Data Input
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Factor Analysis – Analysis Options
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Factor Loadings
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Communalities and Specific Variance
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Shows relative contribution to each variable of common and specific
factors.
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Adding Third Factor
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Factor Loading Before Rotation
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Factor Loading After Rotation
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Varimax rotation tries to spread out the loadings on each factor as much
as possible.
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Scatterplot of Factor Scores
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T-Squared Chart
Hotelling’s T2 measures the distance of each observation from
the centroid of the data, in a standardized scale.
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T-Squared Decomposition
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Large values indicate that a particular variable has a big effect on T-Squared
for that observation.
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Control Ellipse (2 variables at a time)
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Control Ellipse (2 variables at a time)
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T-Squared chart for First 3 Principal
Components
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Uniwin from Sigma Plus
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Uniwin PCA
Allows for supplemental variables or observations.
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Supplemental Variables are Passive (quantitative and qualitative)
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Correlation Circle
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2D Scatterplot with symbols
proportional to squared cosines
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2D Scatterplot with selection based on
squares cosines
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Multidimensional Scaling (Uniwin)
Objective: to display the observations in a low dimensional
coordinate system such that the distance between data points
is distorted as little as possible.
Input: an N by N matrix of similarities (or dissimilarities).
Output: a map displaying the location of the points in 2
dimensions.
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Preparing a New Data File
Step 1: removed all rows with incomplete data on the 8
variables of interest.
Step 2: used the STANDARDIZE operator to subtract the mean
of each column and divide by its standard deviation.
Step 3: saved a new data file named “countries scaled for
UNIWIN.sf6”.
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Load Standardized Variables
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Create Matrix of Distances between
Points (197 by 197)
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Analyze the Distance Matrix
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Scatterplot of Countries
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Observed versus Calculated Distances
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More Information
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Statgraphics Centurion: www.statgraphics.com
Uniwin: www.statgraphics.fr or www.sigmaplus.fr
Or send e-mail to [email protected]
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