Model Averaging

Why choose a model?

Average predictions across models via stacking

## pp_average(attendance_brms, attendance_brms_add_re)

     Estimate Est.Error Q2.5  Q97.5
[1,]   3.9950  2.827536    0 11.000
[2,]   3.8250  2.579925    0 10.000
[3,]   2.7075  2.184921    0  8.000
[4,]   3.6575  2.686678    0 10.025
[5,]   3.5975  2.293173    0  8.025
[6,]  11.9450  4.857568    4 23.000