st: Constraining alpha and theta in slogit

[Michael Hout <mikehout@berkeley.edu>]

I would like to constrain the alpha and theta parameters in slogit 
(stereotyped ordinal regression).
But I cannot figure out what to call the alpha and theta terms in the model.

constrain def alpha_1_1={expression}

and

constrain def _alpha_1_1={exression}

both fail.

-Mike Hout
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