There is an updated version of the EPV-calculator found here: https://infovoice.se/epv-calculator/

Suggested pre-reading	What this web page adds
Introduction to statistics Observations and variables Inferential statistics Choosing statistical analysis Associations and predictions Regression and correlation	This web-page provides an introduction to multilevel models. Reading this will give you some understanding of it and when to use it.

(This page is still under construction. Sorry for the inconvenience.)

What is Multilevel Modelling? Start by watching a lecture held by by Mark Tranmer:

Different levels of nesting are put into the model as “random effects”. For each level how many “groups” do you need to have? Usually at least five . It might be a good choice to refrain from multilevel modelling if you have less than five groups on any given level.

Further reading

• Multilevel modelling online course by Centre for multilevel modelling at University of Bristol
• Analysing repeated measures with Linear Mixed Models (Random Effects Models)
• SAS support about the difference between fixed effects and random effects.
• Lecture by John Nezlek
• Duke University about multi-level models.

References

There is an updated version of the EPV-calculator found here: https://infovoice.se/epv-calculator/