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Bounds for probabilities of small relative errors for empirical saddlepoint and bootstrap tail approximations. (English) Zbl 0927.62017
Summary: To obtain test probabilities based on empirical approximations to the distribution of a Studentized function of a mean, we need the approximations to be accurate with sufficiently high probability. In particular, when these test probabilities are small it is best to consider relative errors. Here we show that in the case of univariate standardized means and in the general case of tests based on smooth functions of means, the empirical approximations have asymptotically small relative errors on sets with probability differing from 1 by an exponentially small quantity and that these error rates hold for moderately large deviations.
In particular, for standardized deviations of order $$n^{1/6}$$, the probabilities approximated are exponentially small with exponents of order $$n^{1/3}$$ and the corresponding relative errors tend to zero on sets whose complements have probabilities of the order of the probabilities being approximated.

##### MSC:
 62E20 Asymptotic distribution theory in statistics 60F10 Large deviations 60F05 Central limit and other weak theorems 62F03 Parametric hypothesis testing
##### Keywords:
exponential error rates; smooth functions of means
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##### References:
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