Get Adaptive Designs for Sequential Treatment Allocation PDF
By Alessandro Baldi Antognini, Alessandra Giovagnoli
ISBN-10: 1466505753
ISBN-13: 9781466505759
Adaptive experimental designs are sequential tactics for gathering info. In every one step, the observer can use the entire details amassed to figure out even if to prevent or keep it up with the examine. This booklet specializes in lately constructed equipment in adaptive randomization for therapy allocation. It illustrates designs that take note of prior therapy allocations in basic terms, discusses methods that use earlier info, and provides compromise techniques that care for moral issues.
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Additional info for Adaptive Designs for Sequential Treatment Allocation
Example text
Then, at each step n ≥ 2n0 , let γn be an estimator of the parameter γ based on the first n observations, which is consistent in the iid case. 33) where the function ϕ(x, y) : [0; 1] × Rq → [0; 1] is decreasing in x. s. ∀γ. 2 play a complementary role: by applying either of them it is often possible to prove the convergence of a given sequential design. 4, whether or not the sequential design is adaptive, the maximum likelihood estimators (MLEs) are the same as if the observed design points and the sample size were predetermined.
Understanding the reasons why data are missing helps in analyzing the remaining data. If values are missing at random, the data sample may still be representative of the population, but if the values are missing systematically, the analysis is harder. To our knowledge, a clear investigation of the effect of missing data on response-adaptive procedures as well as on the corresponding inference is still an open problem to this date. 14 Simulating adaptive designs We would like to end this chapter with some personal comments on computer experiments.
3 An “up-and-down” design The Up-and-Down designs are examples of randomization rules that depend on the observed data, but are different from the ones considered so far in that the v treatments are ordered. They will be studied in depth in Chapter 3: here we mention just a simple case to illustrate the Markov property. Assume the probability of a positive response in a binary experiment to be a strictly increasing function Q(x) of a stimulus x, for instance the level of a potentially lethal or teratogenous drug.
Adaptive Designs for Sequential Treatment Allocation by Alessandro Baldi Antognini, Alessandra Giovagnoli
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