And according to the null hypothesis of hypothesis testing, the theory of panel unit root test and co-integration test are systemically described.
其次，按照假设检验的零假设进行分类，系统阐述面板单位根检验和协整检验理论。
By means of Panel Co-integration Test, this article analyzes the relationship between advertising fee and sales with the sample data from 2002 to 2006.
利用中国2002年到2006年期间的相应的销售额和广告费用的样本数据，运用面板协整分析来研究广告费用对公司销售额的影响。
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