Plotting data, applying statistical models and scanning through big tables with loads of variables is what I have to deal with in my everyday life. This is my collection of tips and snippets that I spent much time on browsing the web for and many hours of trial and error.
formula = vital_parameter ~ visit * treatment + (1|subject_id) formula = as.formula( paste( variable_parameter, "~ visit * treatment + (1|subject_id)" ) )