Estimation of discrete multivariate densities for computer-aided differential diagnosis of disease
用于计算机辅助疾病鉴别诊断的离散多元密度估计AI 解读 ↓
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用于计算机辅助疾病鉴别诊断的离散多元密度估计AI 解读 ↓
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A Bayesian approach is taken to the problem of estimating a multivariate discrete density. Prior distributions on the space of multivariate densities are formulated to reflect the idea that the density is near a particular one, or near one which has independent variates. Given a sample of multivariate observations, an approximation to the posterior distribution of the unknown density is developed, and simple formulae for a density which approximates the mode of this posterior distribution are given. The estimate is developed in particular when the variates are binary and the prior distribution reflects that the variates are nearly but not exactly independent. The degree of apparent lack of independence in the sample determines how far from the usual estimate assuming independence this estimate will be. The proposed estimate can be thought of as interpolating between the histogram or ‘cell frequency’ estimate and an estimate assuming independence.