This paper considers the statistical and economic justification for one widely-used method of adjusting data from social experiments to account for dropping-out behavior due to Bloom (1984). We generalize the method to apply to distributions not just means, and present tests of the key...

We estimate the effects of the vocational rehabilitation (VR) program run by the Canada Pension Plan Disability Program using administrative data. Identification relies on "selection on observed variables" plus careful comparison group selection and institutional knowledge regarding sources of...

Non-experimental evaluations of programs compare individuals who choose to participate in a program to individuals who do not. Such comparisons run the risk of conflating non-random selection into the program with its causal effects. By randomly assigning individuals to participate in the...