Table 1.

Stress values and LOO errors obtained for different weighting and normalisation methods of the neutralisation matrix

Map dimensions w		2		3		4
		1/Dij	1	1/Dij	1	1/Dij	1
Scaling across sera*	Stress	20 711.9	411 619.7	20 695.7	336 660.6	20 688.7	326 994.1
	Normalised stress	65.69	148.9	65.58	163.1	65.53	173.7
	LOO error	64.72	154.6	66.43	160.2	65.12	171.4
No scaling	Stress	162 443.6	437 582.1	15 987.9	348 807.7	15 954.3	337 882.9
	Normalised stress	50.29	83.71	50.07	98.5	50.02	102.4
	LOO error	50.81	88.89	51.37	99.11	51.62	99.99

*Scaling across viruses performed substantially less well and is not shown.

LOO, leave-one-out.