The Efficiency and Consistency of Approximations to the Jackknife Variance Estimators

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Abstract
The problem considered is the computation reduction for general delete-d jackknife variance estimators. The delete-d jackknife estimator was proved consistent (Shao and Wu 1986), and in this article its mean squared error is shown to have order o(n –2), where n is the sample size. These properties are not shared by the traditional delete-1 jackknife in some situations. Use of the delete-d jackknife, however, requires (n d ) recomputations of a point estimate θ, which increases rapidly as n and d increase. Using techniques from survey sampling, a shortcut can be taken with θ evaluated only m times, m ≪ (n d ). The efficiency and consistency of the resulting jackknife-sampling (hybrid) variance estimators (JSVE's) are studied. If m is chosen so that n/m → 0, the increase in mean squared error by using the JSVE is relatively negligible. For the consistency of JSVE, m → ∞ is sufficient. Hence the JSVE with m < n can also be used to alleviate the computational burden for the delete-1 jackknife in the case where n is large and evaluating θ needs large computations. The performance of JSVE is also studied in a simulation study.

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