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A Predictive Approach to Nonparametric Inference for Adaptive Sequential Sampling of Psychophysical Experiments

机译:对心理物理实验自适应顺序采样的非参数推断的预测方法

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摘要

We present a predictive account on adaptive sequential sampling of stimulus-response relations in psychophysical experiments. Our discussion applies to experimental situations with ordinal stimuli when there is only weak structural knowledge available such that parametric modeling is no option. By introducing a certain form of partial exchangeability, we successively develop a hierarchical Bayesian model based on a mixture of Pólya urn processes. Suitable utility measures permit us to optimize the overall experimental sampling process. We provide several measures that are either based on simple count statistics or more elaborate information theoretic quantities. The actual computation of information theoretic utilities often turns out to be infeasible. This is not the case with our sampling method, which relies on an efficient algorithm to compute exact solutions of our posterior predictions and utility measures. Finally, we demonstrate the advantages of our framework on a hypothetical sampling problem.
机译:我们在心理物理实验中提出了一种关于刺激反应关系的自适应顺序采样的预测账户。我们的讨论适用于序数刺激的实验情况,因为只有弱结构知识可用,使参数建模无选项。通过引入某种形式的部分交换性,我们连续地基于Pólya瓮过程的混合物开发分层贝叶斯模型。合适的实用措施允许我们优化整体实验采样过程。我们提供了几种措施,即基于简单的计数统计或更详细的信息理论量。信息理论实用程序的实际计算通常会变得不可行。我们的采样方法并非如此,这依赖于算法计算后续预测和实用措施的精确解决方案。最后,我们展示了我们对假设的抽样问题的框架的优势。

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