Sample design, sample augmentation, and estimation for Wave 2 of the NSHAP.

Objectives: The sample for the second wave (2010) of National Social Life, Health, and Aging Project (NSHAP) was designed to increase the scientific value of the Wave 1 (2005) data set by revisiting sample members 5 years after their initial interviews and augmenting this sample where possible.

Method: There were 2 important innovations. First, the scope of the study was expanded by collecting data from coresident spouses or romantic partners.