我用stata13执行下面命令; xi: reg $y $x i.year i.id时出现了下列的提示错误:
no room to add more variables
Up to 5,000 variables are currently allowed, although you could reset the maximum using set maxvar; see help
memory.
r(900);
end of do-file
r(900);
请教大家,这该怎么解决呢?谢谢!


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