Specifies a Bernoulli prior for inclusion indicators with a fixed
inclusion probability. Used for edge selection in bgm and
difference selection in bgmCompare.
See also
beta_bernoulli_prior, sbm_prior,
bgm
Other prior-constructors:
beta_bernoulli_prior(),
beta_prime_prior(),
cauchy_prior(),
exponential_prior(),
gamma_prior(),
normal_prior(),
sbm_prior()