Signal Feature | Formula | Abbreviation |
---|---|---|
Simple moving average of sum of range of linear acceleration (4 windows) | \( \frac{{\varSigma^4}_{\mathrm{i}=1}\left[\left( range\left(Xli{n}_i\right)\right) \pm \left( range\left(Yli{n}_i\right)\right) \pm \left( range\left(Zli{n}_i\right)\right)\right]}{4} \) | L-SMA |
Difference to Y | Ygrav–Zgrav–Xgrav | DifftoY |
Sum of range of linear acceleration | (range(Xlin i )) + (range(Ylin i )) + (range(Zlin i )) | SOR |
Sum of standard deviation of linear acceleration | (SD(Xlin i )) + (SD(Ylin i )) + (SD(Zlin i )) | SoSD |
Maximum slope of simple moving average of sum of variances of gravity | \( \frac{SM{A}_{var} = {\varSigma^4}_{\mathrm{i}=1}\left(Var{(Xgrav)}_i \pm Var{(Ygrav)}_i \pm Var{(Zgrav)}_i\right)}{4} \) max(SMA var (2)–SMA var (1), SMA var (3)–SMA var (2), SMA var (4)–SMA var (3)) | G-SMAvar |