This is an old version, view current version.

25.11 Exploiting conjugacy

Continuing the model from the previous section, the conjugacy of the beta prior and binomial sampling distribution allow the model to be further optimized to the following equivalent form.

theta ~ beta(alpha + sum(y), beta + N - sum(y));

To make the model even more efficient, a transformed data variable defined to be sum(y) could be used in the place of sum(y).