Metric choice is calculated by counting the number of times each segment falls on the shortest path between all pairs of segments within a selected distance measured metrically.
Hillier, B. (2009),Spatial sustainability in cities: organic patterns and sustainable forms. In: Koch, D. and Marcus, L. and Steen, J., (eds.) Proceedings of the 7th International Space Syntax Symposium. (pp. p. 1). Royal Institute of Technology (KTH): Stockholm, Sweden. pp. k01.3-4.