Returns the number of deaths in the age interval [Age,Age+AgeInterval). If AgeInterval is not specified it defaults to 1.0. In terms of the survival fraction \(l(x)\) the number of deaths \(_n d_x\) from Age \(x\) for AgeInterval \(n\) is \begin{equation} _n d_x = l(x)-l(x+n) \end{equation} 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 deaths \begin{equation} _n d_{\cause x} = l_\cause(x)-l_\cause(x+n), \end{equation} the number of deaths in age interval \([x,x+n)\) due to cause \(\cause\).
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