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EdM
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added text and link for illustration of bias problem with percentile CI
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This behavior is nicely illustrated on this page, for bootstrapping a statistic so negatively biased that the original sample estimate is below the 95% CIs based on the empirical/basic method (which directly includes appropriate bias correction). The 95% CIs based on the percentile method, arranged around a doubly-negatively biased center, are actually both below even the negatively biased point estimate from the original sample!

Should the percentile bootstrap never be used?

Should the percentile bootstrap never be used?

This behavior is nicely illustrated on this page, for bootstrapping a statistic so negatively biased that the original sample estimate is below the 95% CIs based on the empirical/basic method (which directly includes appropriate bias correction). The 95% CIs based on the percentile method, arranged around a doubly-negatively biased center, are actually both below even the negatively biased point estimate from the original sample!

Should the percentile bootstrap never be used?

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EdM
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Several issues can tendstend to make bootstrapped CIs unreliable. Some apply to all approaches, others can be alleviated by approaches other than the empirical/basic or percentile methods.

Several issues can tends to make bootstrapped CIs unreliable. Some apply to all approaches, others can be alleviated by approaches other than the empirical/basic or percentile methods.

Several issues can tend to make bootstrapped CIs unreliable. Some apply to all approaches, others can be alleviated by approaches other than the empirical/basic or percentile methods.

brief clarification
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EdM
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Reorganized and corrected according to suggestions in multiple comments.
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clarified different issues for CI and p-values
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