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Unbiasedness: Applications to Normal Distributions; Confidence Intervals

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Testing Statistical Hypotheses

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Abstract

A general expression for the UMP unbiased testsĀ of the hypotheses \(H_1:\theta \le \theta _0\) and \(H_4:\theta =\theta _0\) in the exponential family.

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Notes

  1. 1.

    This problem is discussed in Section 3 of Hodges andĀ Lehmann (1954).

  2. 2.

    The relationship \(W=Y/(1+Y)\) shows the F and beta distributions to be equivalent. Tables of these distributions are discussed in Chapters 24 and 26 ofĀ  Johnson, Kotz and Balakrishnan (1995. Vol. 2). Critical values of F are tabledĀ by Mardia and Zemroch (1978), who also provide algorithms for the associated computations.

  3. 3.

    A comparison of these limits with those obtained from the equal-tails test is given byĀ ScheffĆ© (1942); some values of \(C_1\) and \(C_2\) are provided by Ramachandran (1958).

  4. 4.

    The literature on regression is enormous and we treat the simplest model. Some texts on the subjectĀ include Weisberg (1985),Ā  Atkinson and Riani (2000) and Ā Chatterjee Hadi and Price (2000).

  5. 5.

    A method for obtaining the size of this effect was developed by Neyman, and tables have been computed on its basis by Fix. This work is reportedĀ by Bennett (1957).

  6. 6.

    This is the so-called conjugate of the binomial distribution; for a more general discussion of conjugate distributions, see Chapter 4 of Lehmann and Casella (1998) and Robert (1994),Ā Section 3.2.

  7. 7.

    They also do not occur when the posterior distribution of \(\Theta \) is discrete.

  8. 8.

    For a closely relatedĀ  result. see OdĆ©n and Wedel (1975).

  9. 9.

    The problem is simplified here, not just due to the assumption of normality, but also by the assumption that the distribution of \(X_i - u_i\) does not depend on \(\mu _i\), and similarly for the \(Y_i\). In general, when observations are paired approximately according to covariates, then pairs cannot be treated as if they were sampled from a population. A recent treatment is provided in Bai, Romano, and Shaikh (2019).

  10. 10.

    See, for example, Billingsley (1995),Ā p. 417.

  11. 11.

    Actually, all that is needed is that \(f_1,\ldots ,f_c\in \mathcal{F}\), where \(\mathcal F\) is any family containing all normal distributions.

  12. 12.

    A systematic account of this distribution can be foundĀ in in Owen (1985)Ā and Johnson Kotz and Balakrishnan (1995).

  13. 13.

    For additional information concerning inference in inverse Gaussian distributions, see Ā Folks and Chhikara (1978) and Ā Johnson, Kotz and Balakrishnan (1994, volume 1).

  14. 14.

    A similar conclusion holds in the problem of constructing a confidence interval for the ratio of normal meansĀ (Fiellerā€™s problem), as discussed inĀ Koschat (1987). For problems where it is impossible to construct confidence intervals with finite expected length , see Gleser and Hwang (1987).

  15. 15.

    For the corresponding result concerning one-sided confidence bounds, see Madansky (1962).

  16. 16.

    The distribution of R is reviewed byĀ Johnson and Kotz (1970, Vol. 2, Section 32) and Ā Patel and Read (1982).

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Correspondence to Joseph P. Romano .

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Lehmann, E.L., Romano, J.P. (2022). Unbiasedness: Applications to Normal Distributions; Confidence Intervals. In: Testing Statistical Hypotheses. Springer Texts in Statistics. Springer, Cham. https://doi.org/10.1007/978-3-030-70578-7_5

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