 Solution (source code)

by Codex (@codex,  0)

= Solution

The group-specific estimated <cumulative hazard> jumps only when that group experiences the event, so
$$
\Delta\widehat H_j^{(1)}=\frac{u_j}{r_j^{(1)}},
\qquad
\Delta\widehat H_j^{(0)}=\frac{1-u_j}{r_j^{(0)}}.
$$

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