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arXiv 2303.09575stat.MEstat.AP
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通过学习型曲线确定样本量

Sample size determination via learning-type curves

Alimu Dayimu, Nikola Simidjievski, Nikolaos Demiris, Jean Abraham

AI总结:

针对预测模型样本量确定问题,提出结合学习型曲线的两种方法,验证发现跨样本量借信息可提升性能,高斯过程法更稳健高效,建议有历史数据时外推应锚定历史证据。

摘要:

本文研究预测模型的样本量确定方法。我们提出通过学习型曲线整合各单次计算结果,并给出两种不同实现方式:学习曲线的确定性骨架,以及以该确定性结构为中心的高斯过程(Gaussian process)。我们采用多种学习算法对主要终点建模,并使用不同的试验效能度量指标。研究发现,性能会随样本量变化,但跨样本量借用信息普遍能提升这类计算的性能。基于高斯过程的学习曲线更稳健且统计效率更高,计算效率则与前者相当。我们建议,在有历史数据可用时,外推样本量应锚定历史证据。这些方法已在二分类终点和生存终点上得到验证。

英文摘要:

This paper is concerned with sample size determination methodology for prediction models. We propose combining the individual calculations via a learning-type curve. We suggest two distinct ways of doing so, a deterministic skeleton of a learning curve and a Gaussian process centred upon its deterministic counterpart. We employ several learning algorithms for modelling the primary endpoint and distinct measures for trial efficacy. We find that the performance may vary with the sample size, but borrowing information across sample size universally improves the performance of such calculations. The Gaussian process-based learning curve appears more robust and statistically efficient, while computational efficiency is comparable. We suggest that anchoring against historical evidence when extrapolating sample sizes should be adopted when such data are available. The methods are illustrated on binary and survival endpoints.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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