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How-To Guides

The following guides, authored by Dr. Neil W. Polhemus, are designed to help you get the most out of STATGRAPHICS Centurion. They deal with problems beyond what you often see in textbooks, but which occur all too often in practice. (Note: new guides will be added as they are completed, so check back often.)
 

How To Guide Subject Area Description Sample Data Date
How to Perform a Repeatability and Reproducibility Study for Destructive Tests Using STATGRAPHICS Centurion

SPC

Shows how to perform a Gage R&R study when measurements cannot be repeated more than once on the same item. howto13.sgp
howto13.sf6
 
10/29/08
How to Perform a Process Capability Analysis Using STATGRAPHICS Centurion

SPC

Describes a process capability analysis for variable data. Includes methods for dealing with outliers and non-normal distributions. howto1.sgp
howto1.sf6
7/17/05
How to Set a Reasonable Shelf Life Using STATGRAPHICS Centurion

Regression

Describes the construction of a statistical model to aid in setting the shelf life of a product. Includes fitting of nonlinear and polynomial regression models. howto2.sgp
howto2.sf6
7/19/05
How to Construct a Control Chart for Autocorrelated Data Using STATGRAPHICS Centurion

SPC

Describes the construction of an ARIMA control chart to deal with data in which adjacent samples are not independent. Includes identification of the proper ARIMA model using Automatic Forecasting. howto3.sgp
howto3.sf6
7/21/05
How to Deal with Multicollinearity When Fitting a Multiple Regression Model Using STATGRAPHICS Centurion

Regression

Describes a method to deal with correlated predictor variables when constructing a multiple regression model. Includes the use of Variance Inflation Factors and Ridge Regression. howto4.sgp
howto4.sf6
7/25/05
How to Forecast Seasonal Time Series Data Using STATGRAPHICS Centurion

Time Series

Describes methods for forecasting data that follows a seasonal pattern. Includes seasonal decomposition, seasonal exponential smoothing, and seasonal ARIMA models. howto5.sgp
howto5.sf6
10/31/05
How to Deal with Heteroscedasticity Using STATGRAPHICS Centurion

Regression and ANOVA

Describes methods for dealing with data in which the variance is not constant. Includes transformations and weighted least squares. howto6.sgp
howto6.sf6
7/28/05
How to Apply SPC Techniques to Correlated Variables Using STATGRAPHICS Centurion

SPC

Describes the proper application of SPC methods to multiple correlated variables. Includes use of the Multivariate Capability Analysis and Multivariate Control Charts procedures. howto7.sgp
howto7.sf6
7/27/05
How to Perform an Optimization Experiment Using STATGRAPHICS Centurion

DOE

Describes a suggested approach to optimization using the DOE procedures. Includes the construction of an initial design, augmenting the design, following the path of steepest ascent, and optimizing multiple responses. howto9.sgp
howto9.sfx
howto9A.sgp
howto9A.sfx
10/26/05
How to Analyze a Split-Plot Design Using STATGRAPHICS Centurion

DOE

Presents two examples of split-plot designs with instructions on how to analyze them. Includes a split-plot design with two categorical factors and a fractional factorial design run with restricted randomization on some factors. howto11.sgp
howto11.sf6
howto11a.sgp
howto11a.sfx
8/13/05
How to Analyze a Repeated Measures Design Using STATGRAPHICS Centurion

DOE

Presents two examples of repeated measures designs with instructions on how to analyze them using the General Linear Models procedure. howto12a.sgp
howto12a.sf6
howto12b.sgp
howto12b.sf6
7/26/06

 

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