Multiple Hurdle Tobit Models
Estimation of models with zero left-censored variables. Null values may be caused by a selection process (Cragg (1971) <doi:10.2307/1909582>), insufficient resources (Tobin (1958) <doi:10.2307/1907382>) or infrequency of purchase (Deaton and Irish (1984) <doi:10.1016/0047-2727(84)90067-7>).
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