first degree approximation

基本解释

The first method is to subject the cell means to an analysis of variance, the second method uses the individual observations and KENWARDROGER approximation for calculation of degree of freedom.
前者以组平均数为基础进行方差分析，后者以原单个数据为基础并采用KENWARDROGER法确定自由度进行分析。
Based on principal state of polarization theory and first-order approximation, an analytical expression of signal degree of polarization(DOP) depending on polarization-mode dispersion(PMD) was given.
依据主偏振态理论和一阶偏振模色散（PMD）近似，给出了信号偏振度（DOP）与PMD的解析关系式。