@article{ref1,
title="Randomized invitations: One solution to the problem of voluntary treatment selection in program evaluation research",
journal="Social science research",
year="1976",
author="Brewer, Marilynn B.",
volume="5",
number="3",
pages="315-323",
abstract="An alternative to randomized assignment to treatments in social program evaluation research is proposed in the form of randomized invitation to treatment. A procedure is suggested for identifying a subset of the uninvited control group that is maximally equivalent to those in the invited group who self-select into treatment in order to increase power to detect treatment effects on outcome measures.<p />",
language="en",
issn="0049-089X",
doi="10.1016/0049-089X(76)90005-3",
url="http://dx.doi.org/10.1016/0049-089X(76)90005-3"
}