The performance of approximations of farm contiguity compared to contiguity defined using detailed geographical information in two sample areas in Scotland: implications for foot-and-mouth disease modelling

Table 4 TSS of different definitions of being contiguous for sample areas in Aberdeenshire and Ayrshire

		Current method
		All premises <1 km point distance	All premises <3 km point distance	All premises <5 km point distance	All premises <26 m field distance	All premises <151 m field distance	All premises <1 km field distance	By Voronoi tessellation	By area weighted tessellation
Aberdeenshire
Gold standard	All <15 m	0.283	0.696	0.391	0.996	0.988	0.885	0.651	0.725
	All <15 m - river	0.289	0.701	0.400	0.991	0.984	0.881	0.650	0.724
	All <15 m - road	0.279	0.705	0.385	0.985	0.978	0.876	0.643	0.725
	All <15 m - river/road	0.285	0.712	0.397	0.981	0.974	0.872	0.642	0.725
	All <15 m - river/road/ditch	0.297	0.702	0.390	0.976	0.969	0.868	0.630	0.723
	All <15 m - river/ditch	0.308	0.686	0.392	0.984	0.977	0.876	0.638	0.722
	Shared fence	0.281	0.705	0.398	0.982	0.974	0.873	0.665	0.737
	Shared fence - river	0.282	0.702	0.395	0.980	0.973	0.872	0.655	0.730
	Shared fence - river/ditch	0.299	0.691	0.390	0.976	0.968	0.868	0.647	0.731
Ayrshire
Gold standard	All <15 m	0.316	0.672	0.386	0.998	0.988	0.899	0.584	0.623
	All <15 m - river	0.320	0.662	0.385	0.995	0.985	0.896	0.580	0.619
	All <15 m - road	0.309	0.680	0.394	0.992	0.982	0.893	0.598	0.637
	All <15 m - river/road	0.314	0.670	0.393	0.988	0.979	0.890	0.595	0.635
	All <15 m - river/road/ditch	0.340	0.671	0.392	0.985	0.975	0.887	0.600	0.632
	All <15 m - river/ditch	0.343	0.664	0.386	0.991	0.981	0.893	0.584	0.617
	Shared fence	0.314	0.672	0.391	0.989	0.980	0.891	0.578	0.620
	Shared fence - river	0.320	0.666	0.392	0.987	0.978	0.889	0.583	0.624
	Shared fence - river/ditch	0.344	0.668	0.391	0.984	0.974	0.886	0.590	0.624

ISSN: 1746-6148