Optimal use of extraneous information concerning a nuisance parameter
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关于干扰参数的额外信息的最优利用AI 解读 ↓
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Suppose that N experiments can be carried out. One type of experiment provides observations, Y, depending on α, the parameter of interest and β a nuisance parameter. The other type provides observations, Z, depending on β and γ. How should the N experiments be divided between the two types to estimate α optimally? The existence and uniqueness of an optimal allocation is proved and a method of calculation is provided. In the particular case of β being scalar, the optimal allocation is given explicitly, and is not necessarily the simple solution consisting of performing only experiments of the first type. In this case, an observation Z may provide additional information concerning α which is more useful than a further observation Y. An application to estimation from truncated data is described and further generalizations are considered.