What are goodness of fit statistics? Is the definition the same for all types of statistical model? Do we run the same tests for all types of statistic model?
[Read more…] about March Member Training: Goodness of Fit Statistics
Mixed and Multilevel Models
Member Training: A Gentle Introduction To Random Slopes In Multilevel Models
A Gentle Introduction to Random Slopes in Multilevel Modeling
…aka, how to look at cool interaction effects for nested data.
Do the words “random slopes model” or “random coefficients model” send shivers down your spine? These words don’t have to be so ominous. Journal editors are increasingly asking researchers to analyze their data using this particular approach, and for good reason.
[Read more…] about Member Training: A Gentle Introduction To Random Slopes In Multilevel Models
Member Training: Missing Data
Missing data causes a lot of problems in data analysis. Unfortunately, some of the “solutions” for missing data cause more problems than they solve.
Three Designs that Look Like Repeated Measures, But Aren’t
Repeated measures is one of those terms in statistics that sounds like it could apply to many situations. In fact, it describes only one specific situation.
A repeated measures design is one where each subject is measured repeatedly over time, space, or condition on the dependent variable.
These repeated measurements on the same subject are not independent of each other. They’re clustered. They are more correlated to each other than they are to responses from other subjects. Even if both subjects are in the same condition. [Read more…] about Three Designs that Look Like Repeated Measures, But Aren’t
Member Training: A Gentle Introduction to Multilevel Models
In this Stat’s Amore Training, Marc Diener will help you make sense of the strange terms and symbols that you find in studies that use multilevel modeling (MLM). You’ll learn about the basic ideas behind MLM, different MLM models, and a close look at one particular model, known as the random intercept model. A running example will be used to clarify the ideas and the meaning of the MLM results.
[Read more…] about Member Training: A Gentle Introduction to Multilevel Models
Multilevel, Hierarchical, and Mixed Models–Questions about Terminology
Multilevel models and Mixed Models are generally the same thing. In our recent webinar on the basics of mixed models, Random Intercept and Random Slope Models, we had a number of questions about terminology that I’m going to answer here.
If you want to see the full recording of the webinar, get it here. It’s free.
Q: Is this different from multi-level modeling?
A: No. I don’t really know the history of why we have the different names, but the difference in multilevel modeling [Read more…] about Multilevel, Hierarchical, and Mixed Models–Questions about Terminology