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