Table 3.

Quality of detected activities of all phone models among different sampling intervals

Sampling Interval (seconds)	Number of identified activities	Number of reference activities	Over detection rate a	Under detection rate a	Mean location deviation (in meters)	Mean duration deviation (in minutes)	Classification quality index
5	638	448	0.157	0.040	0	3.366	0.7801
10	693	448	0.209	0.096	7.361	5.073	0.4659
15	474	448	0.042	0.058	10.64	3.307	0.9222
20	486	448	0.060	0.063	12.97	3.491	0.8711
25	463	448	0.050	0.074	15.1	3.583	0.86
30	470	448	0.066	0.080	15.69	3.665	0.8248
35	465	448	0.069	0.089	19.61	4.18	0.7615
40	469	448	0.072	0.098	18.02	4.004	0.7673
45	448	448	0.060	0.100	20.12	4.279	0.7554
50	419	448	0.076	0.145	20.19	4.714	0.6734
55	380	448	0.058	0.179	24.21	4.905	0.6363
60	359	448	0.070	0.203	22.28	4.042	0.6707
65	308	448	0.055	0.252	21.45	5.752	0.5419
70	295	448	0.068	0.283	22.2	5.924	0.4907
75	294	448	0.109	0.313	29.38	5.613	0.4165
80	353	448	0.099	0.283	23.38	3.926	0.5729
85	316	448	0.104	0.319	32.92	5.653	0.3873
90	267	448	0.112	0.379	25.85	3.501	0.5127
95	260	448	0.096	0.384	33.06	4.802	0.4024
100	246	448	0.089	0.404	28.73	5.192	0.3887

^aOver detection rate: calculated by dividing the number of over detection cases by the number of identified activities;

^aUnder detection rate: calculated by dividing the number of under detection cases by the number of baseline activities.