An elaboration of Campbell and Stanley's (1963) retrospective pretest design to include a "surrogate comparison group" is described. The successful use of the design is illustrated and tested using data from a longitudinal investigation of bereavement outcome following pregnancy loss. The...

In releasing individual data for statistical analysis by outsiders, deletion of direct personal identifiers is sometimes insufficient to preserve confidentiality. Restrictions on the release of data that is publicly listed elsewhere or error innoculation of these variables may be required....