exercises for Wed Apr 21

As agreed upon in the Hjelpetr?d C, here are exercises for Wed April 21:

• Do the Polish girls, perhaps using my code, but with rootFIC scores for models 1, 2, 3, 4, analysed via four curves, as a function of age x_0 = seq(11.0,18.0,by=1/12) or similar. Play a bit with the code and see what you can learn. Do also the AFIC with x_0 = seq(11.0,13.0,by=1/12), and one or two or three importance functions v(u) of your own choice.
• Do the Polish girls, perhaps modifying the Nils code, where we go from models 1 (narrow), 2, 3, 4 (wide) to models 1 (narrow), 2, 3, 4, 5 (wide). How does this change things?
• Speedskating 2000, ..., 2019: first, check what happens if we carefully push out ?dne S?ndr?l for 2000 (since, as we all recall, he fell on the 10k, not because of this, per se).
  • Try one or two more models, perhaps \xi_i = a + b w_i + c w_i^2, \sigma_0 = \sigma_0\exp(\gamma_0 w_i + \gamma_ 2 w_i^2).
• Nils Collection, Exercise 18. ?