Creates a constant mortality from \(q\), \(\mu\) or \(\log\mu\).
The annual mortality rate must be provided as one
(and only one) of q, mu or log_mu as appropriate.
Arguments
- q
The probability of dying over one years. It is required that \(0 < q < 1\).
- mu
The instantaneous annual rate ('force') of mortality. It is required that \(0 < \mu < +\infty\).
- log_mu
The natural logarithm of the instantaneous annual rate ('force') of mortality. It is required that \(-\infty < \log\mu < +\infty\).
- name
An optional name for this mortality.