In the application of pp plots, unconditional variancedistribution of logarithmic return and ARCH type models are tested.
在PP图的应用中，检验了对数收益的无条件方差的分布和ARCH类模型。
2
Figure 1: a normal distribution with mean 3 and variance 1.
图1：平均值为3且方差为1的正态分布。
3
Difference of measurement data was compared with single factor analysis of variance. After normal transformation, the non-normal distribution data were conducted with statistical disposal.