If you are not familiar with three-way interactions in ANOVA, please see our general FAQ on understanding three-way interactions in ANOVA.  In short, a three-way interaction means that there is…
Read More

This page is adapted from the SPSS AnswerNet.  We are grateful to SPSS for permission to use provide their information to adapt and distribute this page from our web site….
Read More

  In general, you can follow the defaults given by SPSS when you install it.  The defaults change slightly depending on the version of SPSS that you are installing.  In…
Read More

This page was adapted from a web page at the SPSS web page.  We thank SPSS for their permission to adapt and distribute this page via our web site. This…
Read More

Categorical variables require special attention in regression analysis because, unlike dichotomous or continuous variables, they cannot by entered into the regression equation just as they are.  For example, if you have…
Read More

This page is intended to be an example of common trend analysis in a repeated measures analysis.  We will use data based on a real consulting problem we received. (We…
Read More

Introduction Panel data analysis, also known as cross-sectional time-series analysis, looks at a group of people, the ‘panel,’ on more than one occasion. Panel studies are essentially equivalent to longitudinal…
Read More

NOTE:  This page was created using SPSS version 19.  Some of the syntax shown below may not work in earlier versions of SPSS. The ggraph command was introduced in version…
Read More

1. A standard ANOVA 2. A standard ANCOVA 3. Estimate slopes for each diet group 4. Test equality of slopes across diet groups 5. Perform tests with separate slopes for…
Read More

This page was adapted from a web page at the SPSS web page.  We thank SPSS for their permission to adapt and distribute this page via our web site. This…
Read More