  In this article, we introduce an estimator for the asymptotic variance of the
Greenwood variance estimator, where the latter is crucial for assessing the
accuracy of the Kaplan-Meier survival estimator. The result indicates that the
asymptotic variance of the Greenwood variance estimator is considerably smaller
than that of the Kaplan-Meier variance estimator. This finding emphasizes the
robustness of the Greenwood estimator.
