IVR (Incremental Velocity Rating) is provided by Daily Sectionals. It looks at raw times and then incorporates factors such as, but not limited to: wind condition, track surface on the day from 1200m to finish, winner’s profile on the day – which Lane/part of the track in home straight, race shape – fast/even/slow pace and major slowdown/acceleration mid race. The IVR number you see is essentially a measurement in lengths. For example: Winx might return an IVR figure of +11.5 for winning the Cox Plate. This means Winx ran 11.5 lengths above benchmark standard. The purpose of IVR figures is to line up performances across different tracks at different points in time. In this example Winx’s +11.5 rating is an overall figure.