e
Hamiltonian, which is the sum of the potential (negative log
probability) and kinetic (squared momentum) energies. In theory, the
Hamiltonian is invariant over the path of the particle and rejection
should never occur. In practice, the probability of rejection is
determined by the accuracy of the leapfrog approximation to the true
trajectory of the parameters.</p>
<p>If step sizes are small, very few updates will be rejected, but many
steps will be required to move the same distance. If step sizes are
lar