This paper introduces a new bootstrap approach to the construction of confidence regions for Average Treatment Effect (ATE) identified sets. Minimum Hausdorff distance bootstrap confidence regions are developed and shown to be valid under suitable regularity. A novel measure of the discrepancy...

Health related data with discrete ordered dependent variables are often characterised by excessive 'zero' observations that may relate to two distinct data generating processes. For example, there may be a large proportion of 'no visit' in modeling discrete ordered levels of health service uses...