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arXiv 1609.03508stat.MEstat.CO
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用于复杂模型推理的无似然随机逼近EM

Likelihood-free stochastic approximation EM for inference in complex models

Umberto Picchini

摘要:

介绍了一种求解具有难处理似然模型参数的极大似然方法。我们产生一个似然自由版本的随机逼近期望最大化(SAEM)算法,以最大限度地提高模型参数的似然函数。虽然SAEM最适合于具有易处理的“完全似然”函数的模型,但将其应用于中等复杂的模型是一项困难甚至不可能的任务。我们将展示如何构建一个似然自由版本的SAEM通过使用“合成似然”的范例。我们的方法是完全即插即用,几乎不需要调整,可以应用于静态和动态模型。四个模拟研究说明了该方法,包括随机微分方程模型,随机Lotka-Volterra模型和数据从$g$ -和- $k$分布。MATLAB代码可作为补充材料。

英文摘要:

A maximum likelihood methodology for the parameters of models with an intractable likelihood is introduced. We produce a likelihood-free version of the stochastic approximation expectation-maximization (SAEM) algorithm to maximize the likelihood function of model parameters. While SAEM is best suited for models having a tractable "complete likelihood" function, its application to moderately complex models is a difficult or even impossible task. We show how to construct a likelihood-free version of SAEM by using the "synthetic likelihood" paradigm. Our method is completely plug-and-play, requires almost no tuning and can be applied to both static and dynamic models. Four simulation studies illustrate the method, including a stochastic differential equation model, a stochastic Lotka-Volterra model and data from $g$-and-$k$ distributions. MATLAB code is available as supplementary material.

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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