NOTE: The cross sectional (one point in time) or repeated cross sectional (multiple points in time) data structure should be used for all point-in time-analyses. The data are structured so that a unique observation is a firm.
1- firmid: Unique firm identifier - wave specific
2- Ffirmid: Unique firm identifier - when first observed
NOTE: The panel data are structured so that an observation is a unique firm (wide data), and time-varying variables have a _w# suffix where # denotes the wave. This data structure should be used for any analysis of transitions, whether from February 2020 (#=0) or across specific wave point in times (#), or any combination of these times.
The Panel important variable names [where the first # is the base wave and the second # is the subsequent wave]:
· Firm weight: firm_wt_#
· Firm panel weight: panel_wt_#_#
· Unique Firm identifier: firmid_#