摘要
根据对绍兴、德清、常山县50个生态农业试点户全面调查的资料,研究了5种数据转换方法在三级指标体系下对平均值、最大最小值、标准差、标准误的影响以及6种聚类方法的分类效果.结果表明以(X_i-X_(min))/(X_(max)-X_(min))转换方法的效果较好,此法与用夹角余弦法建立的模糊聚类模型结合的分类效果最为令人满意.
Based on the data of 50 ecological experimental farms located in Shaoxin, Deqing and Changshan counties, effect of 5 data transformation methods on the averages, maximum and minimum values, standard deviations and standard errors of the indices at three hierarchical levels and effect of 6 classification methods were studied. The results indicated that the effect of data transformation with (Xi -Xmin ) / ( Xm a x - Xmin ) was the best, which combined with the fuzzy luster model using cosine method for calculation of similarity index was the most satisfactory method for classification.
关键词
生态农业
数据转换
聚类方法
ecological agriculture
data transformation
characteristic number
classification methods
