Logistic曲线方程的解析与拟合优度测验

为充分利用Logistic曲线的载荷信息,通过Logistic曲线生长过程速度函数的一阶和二阶导数,得到了Logistic曲线增长或生长过程的始盛期、高峰期、盛末期的分点分别为:t1=(lna-1 317)/b,t2=(lna)/b,t3=(lna+1 317)/b。也可用速度函数的两个拐点将Logistic曲线的生长过程分为渐增期(t=0～(lna-1 317)/b)、快增期(t=(lna-1 317)/b～(lna+1 317)/b)、缓增期(t=(lna+1 317)/b)～∞)。提出采用适合性x2测验,进行Logistic曲线回归方程拟合优度测验。并进行了实例分析和讨论。

红菜薹白花花色遗传的初步研究

1材料与方法 芸薹属蔬菜中甘蓝和白菜(包括普通白菜、结球白菜和菜心、红菜薹)花瓣颜色多为黄色,有人在结球甘蓝[1]和菜心[2]等中发现了白色花瓣类型,但未见在红菜薹中发现白花花色材料和有关遗传研究报道.

Robust Principal Component Test in Gross Error Detection and Identification

Principle component analysis （PCA） based chi-square test is more sensitive to subtle gross errors and has greater power to correctly detect gross errors than classical chi-square test. However, classical principal com- ponent test （PCT） is non-robust and can be very sensitive to one or more outliers. In this paper, a Huber function liked robust weight factor was added in the collective chi-square test to eliminate the influence of gross errors on the PCT. Meanwhile, robust chi-square test was applied to modified simultaneous estimation of gross error （MSEGE） strategy to detect and identify multiple gross errors. Simulation results show that the proposed robust test can reduce the possibility of type Ⅱ errors effectively. Adding robust chi-square test into MSEGE does not obviously improve the power of multiple gross error identification, the proposed approach considers the influence of outliers on hypothesis statistic test and is more reasonable.

关于装置型工业工序能力指数与实际工序工艺合格率不符问题的探讨

对于装置型工业工序能力指数与实际工序工艺合格率不符的问题，本文对三明化工厂有关石灰氮电石炉料细度进行了统计，计算出实际工艺合格率及相应的工序能力指数，并通过抽样，用四种方法计算出四种标准偏差S、R／d2、Sx、S／n。据此计算出四种理论工序能力指数及理论工艺合格率，然后从实际工序能力指数与理论工序能力指数的差异比较及实际工艺合格率与理论工艺合格率的差异比较，看出来用S／n标准偏差计算出的工序能力指数和工艺合格率最接近（甚至超过）于实际的工序能力指数和实际工艺合格率。进而，对理论工艺合格率与实际工艺合格率是否相符进行了卡平方显著性测验，得出有95％的可靠性认为理论工艺合格率与实际工艺合格率是相符的。