By exploratory statistic analysis, the paper gave bivariate frequency contingency tables between every qualitative variable and every publishing company.
通过探索性统计分析，给出了调查报告中各定性变量和出版社间的二向频率列联表。
Using method of qualitative theory of ordinary differential equation, studies economic harvesting model with variable price and cost for a single population.
利用常微分方程定性理论的方法讨论了价格成本变化的单种群经济捕获模型。
Based on the above qualitative analysis, it constructs an inventory optimizing model for manufacturer and storing company respectively, fingers out an optional result of the cost decision variable.
在前面定性分析基础上，分别建立生产型企业和销售型企业有需求提前期的库存优化模型，得出成本决策变量的最优解。
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