The older standard is PSID (current version V4). The structure of the PSID started with two distinct samples. This is similar to the American Panel Study of Income Dynamics (PSID). This is despite Natchez and Vidalia being served by the same cable headend (PSID #003002). The Child Development Supplement (CDS) is a research component of the PSID. The CDS 2014 includes all eligible children in PSID households born since 1997. To ameliorate the potential bias, two additional samples were added to the PSID. By 2003, the PSID had collected information on more than 65,000 individuals.