摘要
应用非参数核密度估计理论和方法 ,对林分结构进行模拟中 ,一个必须解决的问题就是窗宽的确定 ,这也是非参数核密度估计在实际应用中的核心问题 ,它直接影响模拟精度 .文中给出了 5种确定窗宽的办法即最小积分均方误差法、极大似然法、卡方检验法、正态分布法、经验公式法 ,基本上能够满足林业需要 .文章最后 ,给出了利用卡方检验法对从吉林省汪青林业局抽取的 1
One problem which should be solved is how to determine window width when theories and methods of nonparametric kernel density are employed to simulate stand structures,which is also the core of applying the nonparametric kernel density estimation in practice and directly related to simulation precision.Five methods of determining window width were provided in this paper,i.e.,minimum integral mean square of errors,maximum likelihood,chi-square test,normal distribution,and empirical equation,which basically met the requirements in forestry.One example was given out to obtain optimum window width by means of chi-square test method with 13 natural forest plots sampled from Wangqing forestry bureau,Jilin Province.
出处
《西南林学院学报》
1999年第4期210-214,共5页
Journal of Southwest Forestry College
基金
1998~ 1999年中国林业科学研究院基金项目"非参数统计在直径结构及林分预测中的应用研究"的部分内容
关键词
窗宽
直径分布
非参数统计模型
林分表
林分结构
Window width
Diameter distribution
Kernel density estimation
Nonparametric statistical model
Stand table
