Table 2.
Confusion matrix of activity identifications by actual activity type and device.
| Activity and device | Identifications | Misclassified as a | ||
|
|
Correct | Erroneous |
|
|
| Treadmill walk | ||||
|
|
Fitbit Flex 2 | 30 | 1 | Run (1) |
|
|
Fitbit Charge 2 | 31 | 0 | —a |
|
|
Fitbit Alta HR | 31 | 0 | — |
|
|
Garmin Vívosmart HR | 28 | 0 | — |
| Treadmill run | ||||
|
|
Fitbit Flex 2 | 31 | 0 | — |
|
|
Fitbit Charge 2 | 31 | 0 | — |
|
|
Fitbit Alta HR | 30 | 1 | Aerobic workout (1) |
|
|
Garmin Vívosmart HR | 29 | 0 | — |
| Embedded run | ||||
|
|
Fitbit Flex 2 | 31 | 0 | — |
|
|
Fitbit Charge 2 | 31 | 0 | — |
|
|
Fitbit Alta HR | 31 | 0 | — |
|
|
Garmin Vívosmart HR | 29 | 0 | — |
| Outdoor walk | ||||
|
|
Fitbit Flex 2 | 33 | 0 | — |
|
|
Fitbit Charge 2 | 32 | 1 | Elliptical (1) |
|
|
Fitbit Alta HR | 33 | 1 | Elliptical (1) |
|
|
Garmin Vívosmart HR | 33 | 0 | — |
| Outdoor run | ||||
|
|
Fitbit Flex 2 | 33 | 0 | — |
|
|
Fitbit Charge 2 | 34 | 0 | — |
|
|
Fitbit Alta HR | 34 | 0 | — |
|
|
Garmin Vívosmart HR | 33 | 0 | — |
| Elliptical | ||||
|
|
Fitbit Flex 2 | 31 | 0 | — |
|
|
Fitbit Charge 2 | 32 | 0 | — |
|
|
Fitbit Alta HR | 32 | 0 | — |
|
|
Garmin Vívosmart HR | 22 | 9 | Fitness (9); Other (6); Run (2) |
| Swim | ||||
|
|
Fitbit Flex 2 | 28 | 4 | Aerobic workout (2); Walk (2) |
aNo activity misclassifications for this device/activity combination.