Linders, Gert-Jan M.; Groot, Henri L.F. de - Tinbergen Instituut - 2006
approaches suggested to deal with zero flows. Apart from the option to omit the zero flows from the sample, various extensions of … Tobit estimation, truncated regression, probit regression and substitutions for zero flows have been suggested. We argue … the end, the results surprisingly suggest that the simplest solution, to omit zero flows from the sample, often leads to …