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these three models are replication in R of stata's code available on the web site of the American Economic Association. The estimation is complicated by the fact that some linear constraints are imposed.
a list of three fitted models:
group: the group-rule-utilitarian model
intens: the intensity model
sur: the reduced form SUR model
Turnout in Texas liquor referenda
COAT:CONL:04micsr
ndvuong(turnout$group, turnout$intens) ndvuong(turnout$group, turnout$sur) ndvuong(turnout$intens, turnout$sur)
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