采用probit模型求回归时,每次一加入某个连续变量就出现如下结果:不知为何。
. probit part $z
outcome does not vary; remember:
0 = negative outcome,
all other nonmissing values = positive outcome
r(2000);
end of do-file
r(2000);我看了一下因变量,part的确取值为0-1,不知哪里出了问题
part | Freq. Percent Cum.
------------+-----------------------------------
0 | 3,121 9.85 9.85
1 | 28,557 90.15 100.00
------------+-----------------------------------
Total | 31,678 100.00


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