  Privacy and nondiscrimination are related but different. We make this
observation precise in two ways. First, we show that both privacy and
nondiscrimination have two versions, a causal version and a statical
associative version, with each version corresponding to a competing view of the
proper goal of privacy or nondiscrimination. Second, for each version, we show
that a difference between the privacy edition of the version and the
nondiscrimination edition of the version is related to the difference between
Bayesian probabilities and frequentist probabilities. In particular, privacy
admits both Bayesian and frequentist interpretations whereas nondiscrimination
is limited to the frequentist interpretation. We show how the introduced
correspondence allows results from one area of research to be used for the
other.
