 and used by
Aarset (1987)
:</p>
<p>$$\phi_n\left( \frac{r}{n}\right) = \frac{\left( \sum_{i=1}^{r} T_{(i)} \right) +
(n-r)T_{(r)}}{\sum_{i=1}^{n} T_i}$$</p>
<p>where \(T_{(r)}\) is the \(r^{th}\) order statistic, with
\(r=1,2,\dots, n\), and \(n\) is the sample size. On the other hand, the option
<cite>'censored'</cite> is an implementation based on integrals presented in
Westberg and Klefsj昼㸶 (1994)
, and using
<code><a href='https://rdrr.io/pkg/survival/man/survfit.html'>survfit</a></code> to compute