chi square distribution

In this paper, we use Chi-square distribution instead of Gaussian distribution as the model of ASE noise. Irregular repeat accumulate ( IRA) codes have high performance very closed to Shannon limit. We apply IRA codes to the long haul fiber communication system.

本文提出用x平方律分布模型代替高斯信道模型，并将高性能的不规则重复累积（IRA）码应用于远程光纤通信系统。

The first step of this method was to allocate standard rank scores to the levels of ordered class variables according to the marginal frequency distribution of the ordered variables, then to form the linear tendency Chi-square statistic referring to the characteristics of linear rank statistic distribution.

该方法首先对有序分类变量的各水平按其边际频数分布配置标准化秩得分，然后按线性秩统计量的分布特征构造线性趋势x~2统计量。

Then, we describe the time distribution of practical overtime by chi-square distribution. After deducing the wage-output efficiency, we take it as the assessing standard of wage-pricing method, and find the optimization model with which the optimal wage-pricing is satisfied.

然后应用X2分布描述了加班时实际工作时间的分布，得出了工资产出效率，以此作为工资定价的评价标准，导出了最优工资定价方案满足的优化模型。

It is found that the pdf is a noncentral chi-square distribution for a synchronized code, but a central chi-square distribution for the unsynchronized situation.

结果发现，对于码同步时，pdf是非中心X平方（Chi-square）分布，然而，对于码非同步时，pdf是中心X平方分布。

Methods the theory of Chi square distribution, the SAS system and sampling survey were used.

方法使用卡方分布的理论，SAS软件及抽样调查方法。