本文用 Monte Carlo 模拟法对1:3匹配设计的条件 logistic 回归模型的配合适度统计量剩余离差、方差比及确定系数的检验效果进行了探讨,结果显示,用 n—p为自由度时能较好地识别正确模型与不正确模型;用迭代法计算参数估计值的收敛成功...本文用 Monte Carlo 模拟法对1:3匹配设计的条件 logistic 回归模型的配合适度统计量剩余离差、方差比及确定系数的检验效果进行了探讨,结果显示,用 n—p为自由度时能较好地识别正确模型与不正确模型;用迭代法计算参数估计值的收敛成功率及配合适度检验统计量的稳定性,都与样本含量有关;样本含量(即匹配组数)以引入模型中的自变量个数的20倍以上为宜。展开更多
[Objective]The aim was to discuss elimination mechanism and equilibrium model about complete linkage gene of panmixis based on fitness.[Method]A mathematical model that gsgenerational evalution of frequency of panmixi...[Objective]The aim was to discuss elimination mechanism and equilibrium model about complete linkage gene of panmixis based on fitness.[Method]A mathematical model that gsgenerational evalution of frequency of panmixis two pairs of complete linkage gene under difference fitness was built by using difference equations to study elimination mechanism and genetic equilibrium state of panncticcoinplete linkage gene.[Result]The panmixis is different from Hardy-Weinberg Equilibrium which reached the equilibrium just by one generation.A method that by using linear equation to calculate the frequency of four gametes and the fitnessed of panmixis was established after detormining is the fitness of 10 genotypes the necessary and sufficient condition of the panmixis to reach balance.[Conclusion]The method is valuable for reference on linkage disequilibrium and hitchhiking effect study.展开更多
Upon the analogy of definition of heterosis and inbreeding depresstion in terms of population genetics, the heterosis is thought to be evaluated overall with fitness. By establishing a mathematical model, the equilibr...Upon the analogy of definition of heterosis and inbreeding depresstion in terms of population genetics, the heterosis is thought to be evaluated overall with fitness. By establishing a mathematical model, the equilibrium status of three genotypes of random mating population （i. e. RR, Rr and rr） under different fitness, which exposes that heterosis is the precondition for multiallele to exist in the population. The heterosis protects the genetic diversity and makes the population owning a stronger self-control and evolution potential by improving the hetemzygote＇s fithess so as not to wash out different types of genes. It deepens Darwin＇s thoughts of individual section by making the individual fitness consonant with population fitness.展开更多
文摘本文用 Monte Carlo 模拟法对1:3匹配设计的条件 logistic 回归模型的配合适度统计量剩余离差、方差比及确定系数的检验效果进行了探讨,结果显示,用 n—p为自由度时能较好地识别正确模型与不正确模型;用迭代法计算参数估计值的收敛成功率及配合适度检验统计量的稳定性,都与样本含量有关;样本含量(即匹配组数)以引入模型中的自变量个数的20倍以上为宜。
基金Supported by Scientific Research Grant of the Education Department of Guangxi Zhuang Autonomous Region(200807MS065)Elite Support Fund for Universities in Guangxi Zhuang Autonomous Region~~
文摘[Objective]The aim was to discuss elimination mechanism and equilibrium model about complete linkage gene of panmixis based on fitness.[Method]A mathematical model that gsgenerational evalution of frequency of panmixis two pairs of complete linkage gene under difference fitness was built by using difference equations to study elimination mechanism and genetic equilibrium state of panncticcoinplete linkage gene.[Result]The panmixis is different from Hardy-Weinberg Equilibrium which reached the equilibrium just by one generation.A method that by using linear equation to calculate the frequency of four gametes and the fitnessed of panmixis was established after detormining is the fitness of 10 genotypes the necessary and sufficient condition of the panmixis to reach balance.[Conclusion]The method is valuable for reference on linkage disequilibrium and hitchhiking effect study.
文摘Upon the analogy of definition of heterosis and inbreeding depresstion in terms of population genetics, the heterosis is thought to be evaluated overall with fitness. By establishing a mathematical model, the equilibrium status of three genotypes of random mating population （i. e. RR, Rr and rr） under different fitness, which exposes that heterosis is the precondition for multiallele to exist in the population. The heterosis protects the genetic diversity and makes the population owning a stronger self-control and evolution potential by improving the hetemzygote＇s fithess so as not to wash out different types of genes. It deepens Darwin＇s thoughts of individual section by making the individual fitness consonant with population fitness.
