Summary
For the problem of testing a composite hypothesis with one-sided alternatives of the mean vector of a two-dimensional normal distribution, a characterization of similar tests is presented and an unbiased test dominating the likelihood ratio test is proposed. A sufficient condition for admissibility is given, which implies the result given by Cohen et al. (1983,Studies in Econometrics, Time Series and Multivariate Statistics, Academic Press): the admissibility of the likelihood ratio test.
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Nomakuchi, K., Sakata, T. A note on testing two-dimensional normal mean. Ann Inst Stat Math 39, 489–495 (1987). https://doi.org/10.1007/BF02491485
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DOI: https://doi.org/10.1007/BF02491485