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- W2048547502 abstract "In adaptive optimal designs, each stage uses a locally optimal design evaluated at the maximum likelihood estimates derived using cumulative data from all prior stages. This dependency on prior stages affects Fisher's information, the asymptotic covariance matrix of the maximum likelihood estimates. Fisher's information is motivated for use in adaptive designs with small samples by deriving the Cramèr–Rao lower bound for such experiments. Then the usefulness of Fisher's information is shown from both a design and an analysis perspective. From a design perspective, the locally optimal stage one sample size is defined in terms of Fisher's information and a procedure to approximate it is suggested. From an analysis perspective, Fisher's information is compared to a commonly used information measure derived by ignoring the stage dependencies and to the observed information. To make the analysis explicit, a two stage design with fixed first stage is examined in the context of a general nonlinear regression model." @default.
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- W2048547502 date "2014-01-01" @default.
- W2048547502 modified "2023-09-26" @default.
- W2048547502 title "Information in a two-stage adaptive optimal design" @default.
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- W2048547502 doi "https://doi.org/10.1016/j.jspi.2013.07.010" @default.
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