卡方分布

Methods χ 2 -test was used to evaluate the distribution between the cases group and the contrasting group,and the statistical analysis was carried out to detect the correlation between favism and ABO blood group.

采用统计学卡方检验判断患儿组与对照组血型分布并进行疾病与ABO血型的关联分析。

Methods Blood types of 1 083 patients with 12 kinds of neurological diseases were determined by A/S standard serum glassine method, and the results were compared with blood type distribution of normal people. Besides. All the data were treated by χ2 test.

用A、B标准血清玻片法对患有神经系统12种疾病的1 083例患者进行血型测定，并与正常人群A、B、O血型分布构成比进行比较，用卡方(χ2)检验进行统计学处理。

Methods Apply epidemiological method on 208 patients to study its syndrome distribution by multivariate statistical analysis.

对208例患者进行临床调研，对所得资料采用卡方检验进行分析，研究其月经期前后单一证型的分布规律。

The study needs enterovirus infections data in Taiwan from 1999 to 2005. The sources of data include the sentinel surveillance system, the Notifiable disease reporting system and the contract lab data. Statistical methods used for the analysis of seasonal variation include graphics, chi-square test for goodness of fit, method of decomposition and circular distribution.

使用之研究材料为1999年至2005年台湾肠病毒的监测资料，包括定点医师於每周报告之手足口病与疹性咽峡炎病例、法定传染病中应报告的肠病毒感染并发重症确定病例与病毒性感染症合约实验室之肠病毒感染检验阳性病例，分别应用绘图、卡方适合度检定、分解法与圆形分布法进行分析。

Due to the violation of the PA condition, the distributions of Wald statistics and Score statistics based on GLS estimators are noncentral x~2 distributions. The efficiency of test based on the GEE mothod is infulenced.

由于PA条件不成立，回归系数的GLS估计不再是渐近无偏的，从而得到的Wald和Score统计量的分布不再是中心卡方分布拉，从而对于检验的效率也产生了一定的影响。

Chi-square test for ascertaining association between membership and performance.

卡方测验：检定两个分布情况之间的差异。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。