I'm estimating a mixed effects model using simulated data. The basis of this is a conjoint experiment: there are N number of countries in the study with P participants and each respondent is shown the...

I have an ltree column containing a tree with a depth of 3. I'm trying to write a query that can select all children at a specific depth (level 1 = get all parents, 2 = get all children, 3 = get all g...

I am using the nlme package in R (4.1.1) to fit a hierarchical growth model. The data are longitudinal (therapy sessions on level 1) nested within patients (level 2). The data are called as follows: v...

I have a database that is represented(roughly) by the following structure. Note that since Entity Framework generates it, the GamePlayer class has the reference to a parent Game instance and GameActio...