1) lognormal model
对数正态模型
1.
In this paper,the insect communities in the canopy of wetland herbaceous plants growing in Tianmu Moutains was investigated and insect spe- cies abundance distribution predicted using neutral model and lognormal model,respectively.
本文对生长在天目山地区的湿地草本植物冠层的昆虫群落进行取样调查,分别采用中性理论模型和对数正态模型预测昆虫多度分布。
2) lognormal distribution model
对数正态分布模型
1.
, lognormal distribution model and Poisson distribution model.
文中介绍了对数正态分布模型和泊松分布模型,在此基础上构造了生育率组合模型。
2.
Simian is discribed with the curve which drafted by lognormal distribution model,and the species diversity of the community is calculated by means of various formulas.
通过拟合对数正态分布曲线描述四面山次生灌丛的种多度格局 ,并用多种公式计算该群落的物种多样性 ,通过比较与分析 ,得出结论 :1四面山次生灌丛群落的种多度关系符合对数正态分布模型 ,结合分布曲线指出在此群落中多度大的物种只有极少数 ,多数物种的多度都偏小 ,从而说明了次生灌丛群落的年轻性与不稳定性 ;2该群落的物种丰富度、均匀度和总多样性指数值都较低 ,揭示次生灌丛作为森林演替的初级群落其结构与组成部分较简单 ,功能还不完善 ,同时指出为提高森林覆盖率 ,有必要保护和发展次生灌丛 ,提高其多样
3) lognormal linear model
对数正态线性模型
4) Bayesian zero-inflated censored lognormal mixture model
Bayesian零膨胀截断对数正态混合模型
1.
Objective To explore the performance of Bayesian zero-inflated censored lognormal mixture model for left-censored data with high zero,and the improvement on estimation caused by specifying informative priors for model parameters.
目的探索应用Bayesian零膨胀截断对数正态混合模型分析超零左截尾数据的估计效果,以及有信息先验的应用对估计的改善。
5) lognormal distribution
对数正态
1.
Based on the classical demonstration methods of GJB,fuzzy demonstration of maintainability index is offered,and fuzzy hypothesis test for the parameter of lognormal distribution is studied.
分析了武器装备维修性验证的重要性,基于国军标中规定的指标验证经典方法,提出了模糊维修性指标验证,研究了对数正态分布参数的模糊假设检验问题;实例表明该方法能有效处理实际问题中具有模糊背景的一些概念,对靶场进行维修性试验与鉴定具有借鉴意义。
2.
This article is aimed to describe the distribution figure on the frequency histogram of geotechnical parameters which obey lognormal distribution,the method of normal checking on the cumulative frequency probability grid paper as well as the statistical method for finding characteristic figure values of parameters,and finally to make the statistics of geotechnical parameters more rational.
本文试图说明服从对数正态分布岩土参数频率直方图的分布特征和在累积频率概率格纸上作正态检验及求取参数特征值的统计方法。
3.
They also have suggested that the lognormal distribution of quantitative trait would be more reasonable.
将Luo和Woolliams模型中的混合正态分布推广到混合对数正态分布,先用矩量法得到各参数的估计值,再将此估计值作为EM(Expectation Maximization)算法迭代的初值进行迭代,将矩量估计和极大似然估计结合起来,提高了EM算法的收敛速度并使修改后的模型更符合生物学事实。
6) lognormal
[英]['lɔɡ'nɔ:məl] [美][lɔɡ'nɔrməl, lɑɡ-]
对数正态
1.
With the help of the large quantity of flight data,We research the distribution of the compared damage that was caused by flying,consist of normal,lognormal and weibull distribution.
利用在某型飞机载荷谱编制过程中提出的比较损伤计算方法,通过统计大量的外场飞参数据,分别按正态分布、对数正态分布和威布尔分布,研究了飞机在实际飞行使用过程中比较损伤的分布规律。
补充资料:对数正态分布
分子式:
CAS号:
性质:若一组测定值取对数后遵从正态分布,则称其遵循对数正态分布。对数正态随机变量x的概率密度函数为,式中μlogx与σlogx2分别为变量logx分布的均值与方差。
CAS号:
性质:若一组测定值取对数后遵从正态分布,则称其遵循对数正态分布。对数正态随机变量x的概率密度函数为,式中μlogx与σlogx2分别为变量logx分布的均值与方差。
说明:补充资料仅用于学习参考,请勿用于其它任何用途。
参考词条