求翻译：首先对高技术产业中5个不同行业的截面的面板数据进行方差分析，发现在各个截面的数据间不存在异方差性，即系统内各截面方程的随机误差项之间不存在异方差，各截面之间和时期之间的协方差为零，相应的假设为：是什么意思？

First, the high-tech industry in five different cross-section of industry panel data analysis of variance, heteroscedasticity found between each cross-section data does not exist, the random error within the cross section equation does not exist heteroscedasticity, the zero covariance between the cr

The first high-tech industries in 5 different industries of the cross-section of the panel data for the variance analysis, found in the cross-sectional data do not exist between different parties, that is, the system of difference between the cross-sectional equations in the random error does not ex

First 5 different profession section kneading board data carries on the variance analysis to the high-tech industry in, discovered does not have the heteroscedasticity in each section data, namely in the system between various sections equation stochastic error term does not have the different varia

5 different industries in the high-tech industry on first section of a variance analysis of panel data, found in various sections of the data does not exist between heteroscedasticity, various sections within the system equations does not exist between the random error heteroscedasticity, between th

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