Dear sci.stat*ers,
I'm reading Collett's book on survival analsyis and cannot figure
out the derivation for the # of individuals at risk in j-th time
interval
[t_j, t_{j+1}].
This # (called effective sample size in SAS documentaion) is
n_j + c_j/2,
where n_j is number alive at j-th interval and c_j is number of
censored survival times.
Can anyone offer an explanation?
Thanks.
.
.
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