Occupancy Variability Diffs

	Function		Occupancy Variability Diffs
	Description		This tool, which is relatively rich, permits a user to monitor how occupancy counts vary over time and allows to drills down on the reasons of the occupancy evolving by considering inflow and outflow traffic
	Access		Workspace > KPIs > Occupancy Variability - click on [Diffs] button
	Input		TV, WEF, UNT, Duration …		See Occupancy Variability base definition for initial parameters for the occupancy monitor.
			Observation Time 1		Select from the recorded occupancy snapshots the one that you want to use as the base value for the diff.
			Observation Time 2		Select from the recorded occupancy snapshots the one that you want to use as the comparison value.
	Output		The tool will perform a calculation internal to the tool. The derived KPI explains the hotspot variability by indicating the stable flow of flights that are in both observations, the inflow of flights that were not in the base but are in the comparison, the outflow of flights that were in the base but no longer in the comparison. Since the latter are subtracted from the base, they are shown as negative values in the graph.
					The top section shows the occupancy counts at observation time 1 , with an evaluation on the stability of the flights seen in each count bar seen at observation time 2:    • Stable – flights in the bar at time2 are still there at time1.    • Inflow  – flights are in the bar at time1, but were not there at time2    • Outflow – flights are not in the bar at time1, but were there at time2. Being in or out can be caused by a shift in level, track, or even a shift in time (earlier or later and in/outside of the occupancy of the base. The middle section shows the flights that have a different TV entry time between observation time 1 and 2. The entry delta is clearly shown in red/green, along with further information  observed at time-1 and time-2. Selecting a flight in the middle section, will then show in the third selection the OPLOG events that occurred between time1 and time2. This helps understand why the TV entry delta observed.