Industry is a characteristic of an individual's job and hence varies over time. There are industry values reported for (potentially) two jobs in each wave of the survey. Industry is chosen by summing earnings associated with the array of variables ws1ind1-ws1ind{max number of waves} and ws2ind1-ws2ind{max number of waves} in the 1990-1993 panels, and ejbind1_1-ejbind1_{max number of waves) and ejbind2_1-ejbind2_{max number of waves} in the 1996-2004 panels and choosing the industry associated with the greatest total earnings. Thus industry is the industry from which greatest earnings are derived in the survey.

1	Manufacturing
2	Wholesale/retail trade
3	FIRE, services, public administration, military
4	Agriculture, mining, construction, transportation, communications, and public utilities
Sysmiss