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> Thanks in advance for your help, > Lucas > > > > * > * For searches and help try: > *http://www.stata.com/help.cgi?search> *http://www.stata.com/support/statalist/faq> *http://www.ats.ucla.edu/stat/stata/* * For searches and help try: *http://www.stata.com/help.cgi?
当建立模型时,问题与管理信息系统规范相关,例如残余的正常性, heteroskedasticity和多重共线性,也被考虑了。如果误差项没有同样变化, Heteroskedasticity是存在模型。在heteroskedasticity面前,估计可能导致一个大标准误差,造成一个错误结论(古吉特拉语, 2003)。健壮标准误差使用了与健壮命令在Stata克服这些问题的组合。