Grau, Eric; Barrett, Kirsten; Wright, Debra; Zheng, Yuhong - Mathematica Policy Research - 2012
conducted Round 4 of the National Beneficiary Survey (NBS) in 2010. The survey, sponsored by the Social Security Administrationâ …€™s (SSA) Office of Retirement and Disability Policy, collected data from a national sample of SSA disability beneficiaries …