Evaluation of the Ticket to Work Program, Implementation ...

A PPENDIX CN ATIONAL B ENEFICIARY S URVEYM ETHODOLOGY AND D ATA T ABLESThis appendix describes the National Beneficiary Survey methods and presents moredetailed information and data that support the survey findings reported in Chapter III. Theappendix is organized as follows:• Section A discusses the purpose of the survey and presents summary statisticson the survey sample.• Section B describes the sample design, including the selection of primarysampling units, clustered and unclustered components, target population, strata,and sample sizes.• Section C discusses the content and design of the survey questionnaire.• Section D describes the data collection process and procedures.• Section E presents additional information and data that support the findingspresented in Chapter III.A. OVERVIEW1. Purpose of the SurveyAs part of the TTW evaluation, MPR is conducting the National Beneficiary Survey(NBS). The survey, sponsored by SSA’s Office of Disability and Income Security Programs,collects data from a nationally representative sample of SSA disability beneficiaries(hereinafter referred to as the Representative Beneficiary Sample), and two cross-sectionalsamples of TTW participants (hereinafter referred to as the Ticket Participant Sample) acrossfour years. In addition, cohorts of TTW participants will be followed longitudinally. In all,four rounds of interviews will be conducted annually beginning in 2004. Data are collectedby means of a computer-assisted telephone interview (CATI) with a computer-assistedpersonal interview (CAPI) followup for beneficiaries who did not respond to the CATIinterview or who requested an in-person interview to facilitate their participation in the