What’s the difference between Mixed and Multilevel Models? What about Hierarchical Models or Random Effects models?
I get this question a lot.
The answer: very little.
random intercept
Confusing Statistical Term #10: Mixed and Multilevel Models
April 20th, 2021 by Karen Grace-MartinThe Difference Between Random Factors and Random Effects
January 9th, 2019 by Karen Grace-MartinMixed models are hard.
They’re abstract, they’re a little weird, and there is not a common vocabulary or notation for them.
But they’re also extremely important to understand because many data sets require their use.
Repeated measures ANOVA has too many limitations. It just doesn’t cut it any more.
One of the most difficult parts of fitting mixed models is figuring out which random effects to include in a model. And that’s hard to do if you don’t really understand what a random effect is or how it differs from a fixed effect. (more…)
Is there a fix if the data is not normally distributed?
February 19th, 2018 by Karen Grace-MartinIn this video I will answer another question from a recent webinar, Random Intercept and Random Slope Models.
We are answering questions here because we had over 500 people live on the webinar so we didn’t have time to get through all the questions.
What packages allow you to deal with random intercept and random slope models in R?
February 13th, 2018 by Karen Grace-MartinIn this video I will answer a question from a recent webinar, Random Intercept and Random Slope Models.
We are answering questions here because we had over 500 people live on the webinar so we didn’t have time to get through all the questions.
What is the intercept for each individual in a random slope model?
September 8th, 2017 by Karen Grace-MartinIn this video I will answer a question from a recent webinar, Random Intercept and Random Slope Models.
We are answering questions here because we had over 500 people live on the webinar so we didn’t have time to get through all the questions.
If you missed the webinar live, this and the other questions in this series may make more sense if you watch that first. It was part of our free webinar series, The Craft of Statistical Analysis, and you can sign up to get the free recording, handout, and data set at this link:
http://TheCraftofStatisticalAnalysis.com/random-intercept-random-slope-models
Impact of Covariance Terms on Random Slope Model
September 6th, 2017 by Karen Grace-MartinIn this video I will answer a question from a recent webinar, Random Intercept and Random Slope Models.
We are answering questions here because we had over 500 people live on the webinar so we didn’t have time to get through all the questions.
If you missed the webinar live, this and the other questions in this series may make more sense if you watch that first. It was part of our free webinar series, The Craft of Statistical Analysis, and you can sign up to get the free recording, handout, and data set at this link:
http://TheCraftofStatisticalAnalysis.com/random-intercept-random-slope-models