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| computeActivityIndex | Compute Activity Index |
| computeActivityIndex.default | Compute Activity Index |
| computeActivityIndex.GT3XPlus | Compute Activity Index |
| print.ActivityIndex | Print method for token |
| ReadGT3XPlus | Read the raw tri-axial accelerometry data csv file by ActiGraph GT3X+. |
| ReadTable | Read the raw tri-axial accelerometry data csv file. |
| Sigma0 | \bar{sigma}_i computing using raw accelerometry data |
| TimeScale | Time scale vector from 00:00:00 to 23:59:59. |