Data collected by means of households’ expenditure survey may present a large proportion of zero expenditures due to many households recording, for one reason or another, no expenditure for some items. Since the seminal paper of Tobin (1958), a large econometric literature has been developed to deal correctly with this problem of zero observations. In particular, a good selection mechanism was introduced by Cragg (1971) and a purchasing mechanism by Deaton and Irish (1984). We propose an encompassing approach with a general three equations model for which a zero expense can be observed either because:

mhurdle provides a set of tools to estimate (by maximum likelihood) and test (using especially vuong test) this generalized hurdle model.


mhurdle is on CRAN.


For the development version, use