Staged representations of the model involve a set of process area goals whereby each level you attain establishes a foundation for the next level.
2模型的阶段式表述涉及到你所达到的每一等级的一系列过程域目标，为下一个等级建立基础。
Meanwhile, considering the ratio of non desertified land area and different degree desertified land area, a regional evaluation model of land desertification level was given out.
在此基础上，考虑到非荒漠化土地及各程度荒漠化土地在面积上的组成比例，给出区域性土地风蚀荒漠化总体水平评价模型；
Conclusion: This study model may be useful for various population level of data and materials in small area, also for analysis of risk factor of other rare disease such as other tumor.
结论：集合数据分析模型可用于小地域的各种群体水平的数据分析，及其它肿瘤等少见病的危险因素研究。
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