Non-housing wealth = total wealth minus home equity, collected in the following waves, by panel: Wave 4 in the 1984 (HHTWLTH, HHTHEQ), 1990-1993 (HH_TWLTH, HH_THEQ); Wave 3 in 1996, 2001, & 2004 (THHTWLTH, THHTHEQ) panels; Wave 4 in 2008 panel (THHTWLTH, THHTHEQ).