Returns the death probability for age interval [Age,Age+AgeInterval). If AgeInterval is not specified it defaults to 1.0. Death probability \(_n q_x\) given by the expression \begin{equation} _n q_x = \frac{_n d_x}{l(x)} \end{equation} where \(_n d_x\) is the number of deaths from Age \(x\) for AgeInterval \(n\) and \(l(x)\) is the survival fraction. The optional argument Cause is a comma-separated list of cause codes possibly prefixed by '~' to denote the complement. If MortHandle is a multiple decrement mortality and Cause is specified then the function returns the cause-specific death probability \begin{equation} _n q_{\cause x} = \frac{_n d_{\cause x}}{l(x)}, \end{equation} the probability of dying from cause \(\cause\) in age interval [Age,Age+AgeInterval).
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