Fig. 5From: Using automated active infrared counters to estimate footfall on urban park footpaths: behavioural stability and validity testingRelationship between the number of groups per one-hour observation period and the difference between automated active infrared and manual observation counts. Scatter points represent a directional count for one-hour observation periods (two directional counts per observation period). Dashed line represents the linear trendline (r2 = 0.78, p < 0.001). Solid line represents the line of unityBack to article page