EngineBuilder.add_posterior()

EngineBuilder.add_posterior(duration, thinning=1)

Adds posterior epochs.

Note that the order in which you add epochs matters. Adaptation epochs should usually come before all other epochs.

See also

add_posterior

For adding posterior epochs.

add_burnin

For adding burnin epochs.

add_adaptation

For adding adaptation epochs.

set_duration

An alternative method to specify adaptation and posterior epochs, see notes for details.

Notes

There are some differences in the details between the methods add_posterior(), add_adaptation(), add_burnin() and set_duration().

• set_duration() overwrites all existing epochs with the epochs defined in this method. In contrast, the add_ methods only add additional epochs that are appended to the potentially existing ones.

• set_duration() sets both adaptation and posterior epochs, while each add_ method only adds epochs of one type.

• set_duration() has an argument term_duration that defines the number of samples drawn in the final fast adaptation epoch, and it defaults to a fixed value of 50 samples. In contrast, add_adaptation() defines the number of samples drawn in the final fast adaptation epoch as a fraction of the total number of adaptation samples, and allows users to change this fraction via the argument term. As a result, if add_adaptation() is used, the length of the final fast adaptation phase increases automatically, if the total number of warmup samples increases, while it remains constant if set_duration() is used.