我对6年的数据进行多元回归分析,用xtset进行面板数据设置,以上市公司代码(stkcd)和年份(year)作为两个维度,输入命令:xtset stkcd year之后,出现以下错误,该怎么解决:
[P] error . . . . . . . . . . . . . . . . . . . . . . . . Return code 109
type mismatch;
In an expression, you attempted to combine a string and numeric
subexpression in a logically impossible way. For instance, you
attempted to subtract a string from a number or you attempted
to take the substring of a number.
(end of search)


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