3 ms·

Because it fits by multiplying random variables. It cannot explain why records are improving, i.e. why Usain Bolt didn't live 100 years ago.

• suavesito 3y ago
  It can explain it. Better training and better equipment are (at least) two variables that improve people timings. Maybe a century ago there was an Usain Bolt, just didn't had neither the proper training, nor equipment, and those low factors avoided better timings.
  • iLoveOncall 3y ago
    And nutrition of course.
  • tgv 3y ago
    Except the model was fitted on people from the same period in the same region. Also, Ethiopian runners would be a counterargument. It's just reading way too much in a model that probably was there before the data. Seeing how everybody defends it as "learning", the example was sought to be described by the model.