Solution
= Solution
Without censoring, every $v_i=1$ and $\mathbb E T_i=1/\lambda$. Therefore
$$
\frac{\mathbb E\sum_i v_i}{\mathbb E\sum_i x_i}
=\frac n{n/\lambda}=\lambda.
$$
This is events divided by total <person-time at risk>.
= Solution
Without censoring, every $v_i=1$ and $\mathbb E T_i=1/\lambda$. Therefore
$$
\frac{\mathbb E\sum_i v_i}{\mathbb E\sum_i x_i}
=\frac n{n/\lambda}=\lambda.
$$
This is events divided by total <person-time at risk>.