The reliability of ProZone MatchViewer: a video-based technical performance analysis system

The aim of the present study was to determine the inter-observer reliability of ProZone's MatchViewer system. Two groups of trained observers independently analysed an English FA Premier League soccer match. In total, 2552 events were recorded by both observers with 12 events being recorded only by the first observer and 37 events being recorded only by the second observer. The mean absolute error of event time was 0.007 s with very good strengths of inter-observer agreement found for event type (κ = 0.990), player (κ = 0.995) and second player involved in the event (κ = 0.979). The mean absolute error in pitch location of event was 3.6 m with the location of 95% of events being agreed by the two observers to within 8.5 m. The results suggest that ProZone's MatchViewer system is reliable when operated by observers that have undergone the recommended quantity of end-user training.