stata小白，照着书做这个但是跑不出来，请问大神哪里出问题了吗？或者不做这个有大问题吗？不做这个的话还有什么可以做的吗？是面板数据，y是1,2,3。
. mlogtest,hausman base

Problem determining number of categories.

**** Hausman tests of IIA assumption

Ho: Odds(Outcome-J vs Outcome-K) are independent of other alternatives.
You used the old syntax of hausman. Click here to learn about the new syntax.

(storing estimation results as _HAUSMAN)
factor variables and time-series operators not allowed
r(101);

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