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 |
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