We claify cities as different groups.Here are our groups:
P中心模型
Compositions, and there are many residents there.Thus, when we determine a
medicine, the deliver is often in geography center of the region.P-MEDIAN MODEL
斜率的表达
最小二乘法拟合 Least square fitting Sensitive Analysis We change initial speed of the production of the medicine b1 and total cases of patients are shown in the following figure: So this proves that the slight fluctuations of can be ignored and the results we conclude in the model are reliable.As the figure shows, the total cases stay relatively stable in different result generated from different.Therefore, the total cases we use is exact enough.
Strengths and weakne Strengths •Comprehensivene: From the perspective of both depth and width, we determine the importance based on a variety of indexes.•Adaptability and Practicability: The model we build has good portability, it is suitable for most network analysis.•Simplicity and Accuracy: The programs of the model are easy to understand, and the calculations are precise.•Flexibility: No matter whether the weight is added to the nodes or links,and whether there are changing nodes in the network, the model is flexibleis able to tackle it.Weaknees •Data limitation: The model is applicable to large volumes of data network.Unfortunately, if the data of a network is limited, the error is large.
