Table 5.
Accuracy by disease severity.
| Subset | Number labeled files | Kendall τβ | DDK rate mean absolute error (std) | Mean estimated DDK rate (syllables per second) | Mean ground truth DDK rate (syllables per second) |
|---|---|---|---|---|---|
| Healthy | 101 | 0.92 | 0.12 (0.25) | 7.19 | 7.19 |
| ALSFRS-R = 4 | 93 | 0.98 | 0.04 (0.12) | 7.18 | 7.18 |
| ALSFRS-R = 3 | 548 | 0.97 | 0.10 (0.26) | 5.84 | 5.9 |
Note. Comparative analysis of error was performed for a set of labeled DDK assessments from ALS-at-home for healthy speakers, assessments with ALSFRS = 4, and assessments with ALSFRS = 3. High Kendall τβ was observed between estimated rate and ground truth rate for all three cases. The mean absolute errors for each group were similar as the errors were within one standard deviation of each other. DDK = diadochokinetic.