Table 5.

Spearman correlation values of the performance metrics against each segment time between user and expert data

Metrics	Rho (user)	Rho (expert)	Rho (user)	Rho (expert)	Rho (user)	Rho (expert)	Rho (user)	Rho (expert)	Rho (user)	Rho (expert)
1. CN of EG and VO	0.32	0.36	0.37	0.28	0.42	0.34	0.25	0.27	0.40	0.43
2. CC of EG and VO	0.39	0.33	0.45	0.23	0.43	0.40	0.30	0.24	0.51	0.37
3. CN of EG	0.22	0.24	0.25	0.20	0.27	0.29	0.19	0.13	0.38	0.08
4. CC of EG	0.33	0.18	0.32	0.20	0.31	0.16	0.21	0.19	0.39	0.21
5. No. of blinks/s	0.23	0.18	0.24	0.04	0.28	0.22	0.30	0.23	0.29	0.23
6. Screen time	0.27	0.23	0.28	0.01	0.27	0.25	0.30	0.26	0.31	0.15
7. No. of collisions/s	0.50	0.49	0.60	0.60	0.55	0.50	0.25	0.23	0.69	0.58
8. Path with speed Perf.	0.82	0.98	0.86	0.92	0.91	0.98	0.89	0.99	0.84	0.93
9. Path performance	0.45	0.34	0.66	0.56	0.48	0.35	0.35	0.33	0.75	0.68
10. CN of HP and VO	0.48	0.54	0.36	0.33	0.49	0.53	0.30	0.42	0.51	0.61
11. CC of HP and VO	0.55	0.43	0.44	0.42	0.54	0.44	0.38	0.35	0.63	0.45
12. CN of HP	0.26	0.31	0.27	0.29	0.19	0.23	0.06	0.04	0.31	0.36
13. CC of HP	0.37	0.09	0.36	0.09	0.37	0.07	0.27	0.11	0.56	0.19
14. CC of user inputs	0.53	0.40	0.64	0.60	0.58	0.43	0.31	0.04	0.76	0.64
15. CN of user inputs	0.44	0.41	0.49	0.45	0.51	0.67	0.27	0.43	0.62	0.61
16. Average braking	0.18	0.45	0.35	0.45	0.19	0.20	0.15	0.46	0.26	0.34
17. Average throttle	0.40	0.60	0.43	0.51	0.58	0.73	0.36	0.54	0.69	0.72
18. Average steering	0.40	0.25	0.46	0.47	0.43	0.33	0.32	0.16	0.64	0.44
19. Eye fixations	0.20	0.22	0.18	0.23	0.20	0.02	0.15	0.11	0.25	0.23

Images show the path of each segment along with the expert’s trial. All p values are $<0.001$ and therefore correlations are statistically significant. Correlations which are close to 0 show that the values obtained from the particular metric didn’t reveal any relationship to the improvement of segment time. (Values $\ge 0.40$ are in bold)

CN cluster number, CC cluster centres, VO virtual orientation, EG eye gaze, HP head pose