比率遍历定理
In the forth chapter, by employing the comparison theorem in theory of difference equations together with pure analysis, we get sufficient conditions for permanence of a class of ratio-dependent discrete system.
第四章运用差分方程理论中的比较定理和纯分析的方法得到离散系统持久性的充分条件。
Methods A method based on epidemiological theory and Bayes' theorem was established to measure the contribution of individual risk factor, using the relative risk ( RR) or odds ratio ( OR) value obtained from population-based cohort studies or meta-analysis.
方法运用贝叶斯公式,依据相关流行病学理论,建立由相对危险度数值等来测算单个危险因素对个体发病贡献权重的方法。
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