Bartlett identities and large deviations in likelihood theory
似然理论中的 Bartlett 恒等式与大偏差AI 解读 ↓
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似然理论中的 Bartlett 恒等式与大偏差AI 解读 ↓
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The connection between large and small deviation results for the signed square root statistic $R$ is studied, both for likelihoods and for likelihood-like criterion functions. We show that if $p - 1$ Barlett identities are satisfied to first order, but the $p$th identity is violated to this order, then $\operator{cum}_q(R) = O(n^{-q/2})$ for $3 \leq q < p$, whereas $\operator{cum}_p(R) = \kappa_p n^{-(p-2)/2} + O(n^{-p/2})$. We also show that the large deviation behavior of $R$ is determined by the values of $p$ and $\kappa_p$. The latter result is also valid for more general statistics. Affine (additive and/or multiplicative) correction to $R$ and $R^2$ are special cases corresponding to $p = 3$ and 4. The cumulant behavior of $R$ gives a way of characterizing the extent to which $R$-statistics derived from criterion functions other than log likelihoods can be expected to behave like ones derived from true log likelihoods, by looking at th number of Bartlett identities that are satisfied. Empirical and nonparametric survival analysis type likelihoods are analyzed from this perspective via the device of “dual criterion functions.”