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Anscombe’s model for sequential clinical trials revisited

Artikel i vetenskaplig tidskrift
Författare Sebastian Jobjörnsson
Sören Christensen
Publicerad i Sequential Analysis
Volym 37
Nummer/häfte 1
Sidor 115-144
ISSN 0747-4946
Publiceringsår 2018
Publicerad vid Institutionen för matematiska vetenskaper, Tillämpad matematik och statistik
Sidor 115-144
Språk en
Länkar https://doi.org/10.1080/07474946.20...
Ämnesord Free boundary problems, optimal stopping, sequential analysis, sequential design of clinical trials
Ämneskategorier Datavetenskap (datalogi), Sannolikhetsteori och statistik, Beräkningsmatematik

Sammanfattning

In Anscombe’s classical model, the objective is to find the optimal sequential rule for learning about the difference between two alternative treatments and subsequently selecting the superior one. The population for which the procedure is optimized has size N and includes both the patients in the trial and those who are treated with the chosen alternative after the trial. We review earlier work on this problem and give a detailed treatment of the problem itself. In particular, whereas previous work has mainly focused on the case of conjugate normal priors for the incremental effect, we demonstrate how to handle the problem for priors of a general form. We also discuss methods for numerical solutions and the practical implications of the results for the regulation of clinical trials. Two extensions of the model are proposed and analyzed. The first breaks the symmetry of the treatments, giving one the role of the current standard being administered in parallel with the trial. We show how certain asymptotic results due to Chernoff can be adapted to this asymmetric case. The other extension assumes that N is a random variable instead of a known constant.

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