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latest blog posts

Dummy Coding in SPSS GLM–More on Fixed Factors, Covariates, and Reference Groups

March 22, 2023 • Karen Grace-Martin

So the question is what to do with your categorical variables. You have two choices, and each has advantages and disadvantages. The easiest is to put categorical variables in Fixed Factors. SPSS will dummy code those variables for you, which is quite convenient if your categorical variable has more than two categories. However, there are some defaults you need to be aware of that may or may not make this a good choice. SPSS always makes the reference group the one that comes last alphabetically. So if the values you input are strings, it will be the one that comes last. If those values are numbers, it will be the highest one. Read More

Best Practices for Formatting Date Variables

March 9, 2023 • guest contributer

Formatting Date Variables seems like it should be straightforward, but sadly, it’s not. If you are given data that includes dates, expect confusion. Dates can be represented in many different ways. Read More

Member Training: Moderated Mediation, Not Mediated Moderation

February 28, 2023 • TAF Support

Moderated mediation, also known as Conditional Process Modeling, is great tool for understanding one type of complex relationship among variables. Read More