|
Height measurement precision evaluated by different indicators based on absolute (mean and standard deviation – SD), root mean square (RMS) and maximum (max.) errors. |
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| Theoretical |
|||||||||
| Heights Tested |
10.00 |
20.00 |
30.00 |
40.00 |
50.00 |
60.00 |
70.00 |
80.00 |
90.00 |
|
|
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| Empirical Heights |
|||||||||
| Mean* (mm) |
10.19 |
20.01 |
30.18 |
40.15 |
50.12 |
59.77 |
69.74 |
80.01 |
89.71 |
| Mean SD (mm) |
0.56 |
0.41 |
0.47 |
0.81 |
0.78 |
0.71 |
0.72 |
0.86 |
0.87 |
| Mean Error** (mm) |
0.37 |
0.46 |
0.32 |
0.89 |
0.29 |
0.22 |
0.49 |
0.68 |
0.18 |
| SD Error (mm) |
0.44 |
0.45 |
0.29 |
1.13 |
0.16 |
0.17 |
0.48 |
0.92 |
0.11 |
| RMS Error (mm) |
0.55 |
0.63 |
0.42 |
1.39 |
0.32 |
0.27 |
0.67 |
1.10 |
0.21 |
| Max Error (mm) |
1.17 |
1.42 |
0.83 |
3.54 |
0.58 |
0.49 |
1.38 |
3.06 |
0.36 |
|
* Corrected for systematic offset of 0.51 mm ** Relative to the corrected empirical mean | |||||||||
Bourbonnais et al. Journal of NeuroEngineering and Rehabilitation 2008 5:2 doi:10.1186/1743-0003-5-2 |
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