Improving Coverage Accuracy of Block Bootstrap Confidence Intervals

Details Improving Coverage Accuracy of Block Bootstrap Confidence Intervals Improving Coverage Accuracy of Block Bootstrap Confidence Intervals

2008-04-28

arxiv.org/abs/0804.4361v1

Statistics

Methodology

Scientific paper

The block bootstrap confidence interval based on dependent data can outperform the computationally more convenient normal approximation only with non-trivial Studentization which, in the case of complicated statistics, calls for highly specialist treatment. We propose two different approaches to improving the accuracy of the block bootstrap confidence interval under very general conditions. The first calibrates the coverage level by iterating the block bootstrap. The second calculates Studentizing factors directly from block bootstrap series and requires no non-trivial analytic treatment. Both approaches involve two nested levels of block bootstrap resampling and yield high-order accuracy with simple tuning of block lengths at the two resampling levels. A simulation study is reported to provide empirical support for our theory.

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