Linked Questions

There's a lot of discussion going on on this forum about the proper way to specify various hierarchical models using lmer. I thought it would be great to have all ...

I recently measured how the meaning of a new word is acquired over repeated exposures (practice: day 1 to day 10) by measuring ERPs (EEGs) when the word was viewed in different contexts. I also ...

There's a distinction that's tripping me up with mixed models, and I'm wondering if I could get some clarity on it. Let's assume you've got a mixed model of count data. There's a variable you know you ...

Data Structure ...

Background: I am interested in looking at the effects that Culture, Treatment and Time have ...

Let's say I fit this model to the Oats data set lmer(yield ~ Variety + (1|Block/Variety), data=Oats) ...

Problem I want to fit a model using the R lme4 lmer function, and I'm not sure how to specify a random effect that is nested within a fixed effect. Setup I am applying a ...

Problem There are two excellent CV posts on specifying crossed effects models (post 1, post 2). The issue I'm trying to wrestle with pertains to part of the answer to post 2, in particular how to ...

I like to estimate a mixed model with two Random Effects, that are independent of each other and among themselves. I use Panel data with a nested structure (counties $j$ nested within regions $i$). ...

I have a question about nested mixed effect model. For example I have species A with different populations; these populations belong to two kinds of habitat types (with or without predators). So I ...

In this post @Ben Bolker wrote in his answer that for the interaction between station and day we could write ...

Goal: comparing pitch (Hz) on three types of words Dependent variable: Hz Fixed predictor variable: word-type, points (measurements taken from five points on each token, to capture Hz change within ...

We have collected data from n patients, with each patient having one eye treated and the other untreated. We would like to see if the treated eye progresses differently to the untreated eye using ...

I'm struggling to figure out the right model specification for my data. Here's my design: a between-subject longitudinal study, with two Type of participants (...

I see sometimes people using two different ways to specify the random effects when conducting multilevel modelling with lme4 in R. ...