It is true that epidemiological studies cannot identify cause and effect - they can only point to associations between a suspected causative factor and a health problem.
确实，流行病学不能鉴别出影响的起因—它们只能指出令人怀疑的病因与健康问题之间有相关性。
Objective to identify the cause and transmission route of hepatitis a, to analyse the epidemic fac - tors and to evaluate the control effect.
目的查明甲肝暴发原因和传播途径，分析流行因素，评价控制效果。
Identify process input variables and process output variables, and document their relationships through cause and effect diagrams, relational matrices, etc.
识别过程输入变量和输出变量，通过因果图、关系矩阵记录它们之间的关系。
Identify process input variables and process output variables, and document their relationships through cause and effect diagrams, relational matrices, etc.
识别过程输入变量和输出变量，通过因果图、关系矩阵记录它们之间的关系。
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