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Why Historical study used in research design? 


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Historical studies are utilized in research design to enhance the efficiency and accuracy of various types of trials. Incorporating historical data can improve the operating characteristics of model-assisted designs, such as the Bayesian optimal interval (BOIN) and modified toxicity probability interval (mTPI) designs, similar to model-based designs . Furthermore, leveraging historical data in phase 2 randomized controlled trials can lead to reduced sample sizes without compromising statistical power, especially in oncology Bayesian augmented control (BAC) trials . Historical control trials, which compare experimental treatments with previously conducted controls, can better identify promising treatments in early phases by assigning all samples to the experimental arm . However, it is crucial to consider the limitations of retrospective studies, such as missing information and biases, when interpreting results and planning prospective studies .

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Historical control studies are utilized in research design to compare new treatments with prior controls, aiding in early phase trials to identify promising treatments more effectively than randomized control trials.
Historical studies are used in research design to improve efficiency by reducing sample size, enhancing power, adjusting for prognostic factors, and enabling a more scientific approach to drug development programs.
Historical studies are valuable for investigating rare diseases and outcomes, guiding prospective research. However, they have limitations like missing data and biases, requiring careful interpretation and avoiding overgeneralization.
Historical studies are utilized in research design to analyze the evolution and context of design practices, aiding in understanding the historical panorama and trajectory of the field.
Incorporating historical data in research designs improves phase I clinical trials by enhancing efficiency, accelerating drug development, and refining operating characteristics of model-assisted designs.

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