Prediction is a complex notion, and different predictors (such as people, computer programs, and probabilistic theories) can pursue very different goals. In this paper I will review some popular kinds of prediction and argue that the theory of competitive on-line learning can benefit from the kinds of prediction that are now foreign to it.
@article{arxiv.cs/0606093,
title = {Predictions as statements and decisions},
author = {Vladimir Vovk},
journal= {arXiv preprint arXiv:cs/0606093},
year = {2007}
}