How-To Guides

The following guides are designed to help you get the most out of STATGRAPHICS and provide statistics help online. They give statistical analysis help for problems beyond what you often see in textbooks, but which occur all too often in practice. These online statistics help guides are a supplement to the procedure documentation available on the Statgraphics Centurion and Statgraphics Sigma express Help menus. For more information on getting statistics help online check out our data analysis training seminars.

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

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

Centurion
Sigma express
stratus
How to Perform a Process Capability Analysis Using STATGRAPHICS

SPC

Describes a process capability analysis for variable data. Includes statistics help online for dealing with outliers and non-normal distributions. howto1.sgp
howto1.sf6
Centurion
Sigma express
stratus
How to Set a Reasonable Shelf Life Using STATGRAPHICS

Regression

Provides statistical analysis help for 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
Centurion
Sigma express
stratus
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
Centurion
How to Deal With Multicollinearity When Fitting a Multiple Regression Model Using STATGRAPHICS

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
Centurion
Sigma express
stratus
How to Forecast Seasonal Time Series Data Using STATGRAPHICS Centurion

Time Series

Get statistics help online for forecasting data that follows a seasonal pattern. Includes seasonal decomposition, seasonal exponential smoothing, and seasonal ARIMA models. howto5.sgp
howto5.sf6
Centurion
stratus
How to Deal With Heteroscedasticity Using STATGRAPHICS Centurion

Regression and ANOVA

Describes methods and statistical analysis help for dealing with data in which the variance is not constant. Includes transformations and weighted least squares. howto6.sgp
howto6.sf6
Centurion
Sigma express
stratus
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
Centurion
How to Perform an Optimization Experiment Using STATGRAPHICS Centurion

DOE

Describes a suggested approach to optimization using the DOE procedures. Includes statistics help online for 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
Centurion
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
Centurion
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
Centurion