Table 2. Confusion Matrix of the Time Spent Performing Activities Obtain from the Results of the Classification Model in CE Sessions.
| Class | |||||||
| Walking | Sitting | Running | Lying down | Dynamic Standing | Overall | ||
| Real | Walking | 1334 | 0 | 36 | 0 | 24 | |
| Sitting | 0 | 2552 | 0 | 55 | 10 | ||
| Running | 60 | 0 | 478 | 0 | 0 | ||
| Lying down | 9 | 43 | 0 | 1057 | 15 | ||
| Dynamic Standing | 96 | 9 | 0 | 0 | 734 | ||
| Overall Accuracy (%) a | 94±4 | ||||||
| Sensitivity (%) b | 96±12 | 97±4 | 90±20 | 94±7 | 88±18 | ||
| F-Score (%) c | 76±16 | 98±2 | 88±18 | 94±6 | 90±11 | ||
| Specificity (%) d | 88±4 | 99±2 | 99±2 | 99±2 | 99±1 | ||
| Kappa e | 0.93±0.00 | ||||||
| Linear Weight Kappa | 0.90±0.01 | ||||||
| Quadratic Weighted Kappa | 0.87±0.01 | ||||||
| Class | |||||||
| Walking | Sitting | Running | Lying down | Dynamic Standing | Overall | ||
| Real | Walking | 1334 | 0 | 36 | 0 | 24 | |
| Sitting | 0 | 2552 | 0 | 55 | 10 | ||
| Running | 60 | 0 | 478 | 0 | 0 | ||
| Lying down | 9 | 43 | 0 | 1057 | 15 | ||
| Dynamic Standing | 96 | 9 | 0 | 0 | 734 | ||
| Overall Accuracy (%) a | 94±4 | ||||||
| Sensitivity (%) b | 96±12 | 97±4 | 90±20 | 94±7 | 88±18 | ||
| F-Score (%) c | 76±16 | 98±2 | 88±18 | 94±6 | 90±11 | ||
| Specificity (%) d | 88±4 | 99±2 | 99±2 | 99±2 | 99±1 | ||
| Kappa e | 0.93±0.00 | ||||||
| Linear Weight Kappa | 0.90±0.01 | ||||||
| Quadratic Weighted Kappa | 0.87±0.01 | ||||||
a Overall accuracy is the mean proportion of all activities that are correctly classified per person
b Sensitivity corresponds to the chances of classifying an activity as positive when it is indeed positive
c F-Score is defined as the "harmonic mean between sensitivity and positive predictive values" [18]
d Specificity is a measure of chances of classifying an activity as negative when they are truly negative
e Cohen’s Kappa is the measure of the agreement between the real activity and the classifications